diff --git a/examples/voice-call-flows-create.php b/examples/voice-call-flows-create.php
new file mode 100644
index 00000000..b4e94349
--- /dev/null
+++ b/examples/voice-call-flows-create.php
@@ -0,0 +1,22 @@
+<?php
+
+require_once(__DIR__ . '/../autoload.php');
+
+$messageBird = new \MessageBird\Client('YOUR_ACCESS_KEY'); // Set your own API access key here.
+$callFlow = new \MessageBird\Objects\Voice\CallFlow();
+$callFlow->title = 'Foobar';
+$step = new \MessageBird\Objects\Voice\Step();
+$step->action = 'say';
+$step->options = array(
+    'payload' => 'This is a journey into sound.',
+    'language' => 'en-GB',
+    'voice' => 'male',
+);
+$callFlow->steps = array($step);
+
+try {
+    $result = $messageBird->voiceCallFlows->create($callFlow);
+    var_dump($result);
+} catch (\Exception $e) {
+    echo sprintf("%s: %s", get_class($e), $e->getMessage());
+}
diff --git a/examples/voice-call-flows-delete.php b/examples/voice-call-flows-delete.php
new file mode 100644
index 00000000..31800178
--- /dev/null
+++ b/examples/voice-call-flows-delete.php
@@ -0,0 +1,12 @@
+<?php
+
+require_once(__DIR__ . '/../autoload.php');
+
+$messageBird = new \MessageBird\Client('YOUR_ACCESS_KEY'); // Set your own API access key here.
+
+try {
+    $deleted = $messageBird->voiceCallFlows->delete('7d3c2125-4ab4-4dcb-acf9-1c2dbfa24087'); // Set a call flow id here
+    var_dump('Deleted: ' . $deleted);
+} catch (\Exception $e) {
+    echo sprintf("%s: %s", get_class($e), $e->getMessage());
+}
diff --git a/examples/voice-call-flows-list.php b/examples/voice-call-flows-list.php
new file mode 100644
index 00000000..886ab582
--- /dev/null
+++ b/examples/voice-call-flows-list.php
@@ -0,0 +1,12 @@
+<?php
+
+require_once(__DIR__ . '/../autoload.php');
+
+$messageBird = new \MessageBird\Client('YOUR_ACCESS_KEY'); // Set your own API access key here.
+
+try {
+    $result = $messageBird->voiceCallFlows->getList(array('offset' => 100, 'limit' => 30));
+    var_dump($result);
+} catch (\Exception $e) {
+    echo sprintf("%s: %s", get_class($e), $e->getMessage());
+}
diff --git a/examples/voice-call-flows-read.php b/examples/voice-call-flows-read.php
new file mode 100644
index 00000000..55567ed5
--- /dev/null
+++ b/examples/voice-call-flows-read.php
@@ -0,0 +1,12 @@
+<?php
+
+require_once(__DIR__ . '/../autoload.php');
+
+$messageBird = new \MessageBird\Client('YOUR_ACCESS_KEY'); // Set your own API access key here.
+
+try {
+    $result = $messageBird->voiceCallFlows->read('f24dd28c-90da-4ed6-af92-d8e32a0e5f55'); // Set a call flow id here
+    var_dump($result);
+} catch (\Exception $e) {
+    echo sprintf("%s: %s", get_class($e), $e->getMessage());
+}
diff --git a/examples/voice-call-flows-update.php b/examples/voice-call-flows-update.php
new file mode 100644
index 00000000..ece6c9d8
--- /dev/null
+++ b/examples/voice-call-flows-update.php
@@ -0,0 +1,14 @@
+<?php
+
+require_once(__DIR__ . '/../autoload.php');
+
+$messageBird = new \MessageBird\Client('YOUR_ACCESS_KEY'); // Set your own API access key here.
+$callFlow = new \MessageBird\Objects\Voice\CallFlow();
+$callFlow->title = 'Foobar updated';
+
+try {
+    $result = $messageBird->voiceCallFlows->update($callFlow, '21e5fc51-3285-4f41-97fd-cd1785ab54f8');
+    var_dump($result);
+} catch (\Exception $e) {
+    echo sprintf("%s: %s", get_class($e), $e->getMessage());
+}
diff --git a/examples/voice-calls-create.php b/examples/voice-calls-create.php
new file mode 100644
index 00000000..6b9d9c5a
--- /dev/null
+++ b/examples/voice-calls-create.php
@@ -0,0 +1,26 @@
+<?php
+
+require_once(__DIR__ . '/../autoload.php');
+
+$messageBird = new \MessageBird\Client('YOUR_ACCESS_KEY'); // Set your own API access key here.
+$call = new \MessageBird\Objects\Voice\Call();
+$call->source = '31971234567';
+$call->destination = '31612345678';
+$callFlow = new \MessageBird\Objects\Voice\CallFlow();
+$callFlow->title = 'Say message';
+$step = new \MessageBird\Objects\Voice\Step();
+$step->action = 'say';
+$step->options = array(
+    'payload' => 'This is a journey into sound.',
+    'language' => 'en-GB',
+    'voice' => 'male',
+);
+$callFlow->steps = array($step);
+$call->callFlow = $callFlow;
+
+try {
+    $result = $messageBird->voiceCalls->create($call);
+    var_dump($result);
+} catch (\Exception $e) {
+    echo sprintf("%s: %s", get_class($e), $e->getMessage());
+}
diff --git a/examples/voice-calls-list.php b/examples/voice-calls-list.php
new file mode 100644
index 00000000..7deb377a
--- /dev/null
+++ b/examples/voice-calls-list.php
@@ -0,0 +1,12 @@
+<?php
+
+require_once(__DIR__ . '/../autoload.php');
+
+$messageBird = new \MessageBird\Client('YOUR_ACCESS_KEY'); // Set your own API access key here.
+
+try {
+    $result = $messageBird->voiceCalls->getList(array('offset' => 100, 'limit' => 30));
+    var_dump($result);
+} catch (\Exception $e) {
+    echo sprintf("%s: %s", get_class($e), $e->getMessage());
+}
diff --git a/examples/voice-calls-read.php b/examples/voice-calls-read.php
new file mode 100644
index 00000000..911e35e2
--- /dev/null
+++ b/examples/voice-calls-read.php
@@ -0,0 +1,12 @@
+<?php
+
+require_once(__DIR__ . '/../autoload.php');
+
+$messageBird = new \MessageBird\Client('YOUR_ACCESS_KEY'); // Set your own API access key here.
+
+try {
+    $result = $messageBird->voiceCalls->read('dbf1373c-6781-43c7-bfe4-6538583c444b'); // Set a call id here
+    var_dump($result);
+} catch (\Exception $e) {
+    echo sprintf("%s: %s", get_class($e), $e->getMessage());
+}
diff --git a/examples/voice-legs-list.php b/examples/voice-legs-list.php
new file mode 100644
index 00000000..b718a5a7
--- /dev/null
+++ b/examples/voice-legs-list.php
@@ -0,0 +1,12 @@
+<?php
+
+require_once(__DIR__ . '/../autoload.php');
+
+$messageBird = new \MessageBird\Client('YOUR_ACCESS_KEY'); // Set your own API access key here.
+
+try {
+    $result = $messageBird->voiceLegs->getList('dbf1373c-6781-43c7-bfe4-6538583c444b', array('offset' => 100, 'limit' => 30)); // Set a call id here
+    var_dump($result);
+} catch (\Exception $e) {
+    echo sprintf("%s: %s", get_class($e), $e->getMessage());
+}
diff --git a/examples/voice-legs-read.php b/examples/voice-legs-read.php
new file mode 100644
index 00000000..53e946cb
--- /dev/null
+++ b/examples/voice-legs-read.php
@@ -0,0 +1,12 @@
+<?php
+
+require_once(__DIR__ . '/../autoload.php');
+
+$messageBird = new \MessageBird\Client('YOUR_ACCESS_KEY'); // Set your own API access key here.
+
+try {
+    $result = $messageBird->voiceLegs->read('dbf1373c-6781-43c7-bfe4-6538583c444b', '6f39d883-94ac-4068-9fed-a9e31b77acda'); // Set a call and leg id here
+    var_dump($result);
+} catch (\Exception $e) {
+    echo sprintf("%s: %s", get_class($e), $e->getMessage());
+}
diff --git a/examples/voice-recordings-download.php b/examples/voice-recordings-download.php
new file mode 100644
index 00000000..b135b99e
--- /dev/null
+++ b/examples/voice-recordings-download.php
@@ -0,0 +1,17 @@
+<?php
+
+require_once(__DIR__ . '/../autoload.php');
+
+$messageBird = new \MessageBird\Client('YOUR_ACCESS_KEY'); // Set your own API access key here.
+
+try {
+    $data = $messageBird->voiceRecordings->download('c226420d-f107-4db1-b2f9-4646656a90bc', '4f5ab5f4-c4b6-4586-9255-980bb3fd7336', 'a94f7d51-19b5-4eb8-9e8e-90fce490a577'); // Set call, leg and recording id here
+    echo sprintf("Received %d bytes.\n", mb_strlen($data));
+    $tmpfname = tempnam('/tmp', 'voice-recording-');
+    $handle = fopen($tmpfname, "w");
+    fwrite($handle, $data);
+    fclose($handle);
+    echo sprintf("Wrote to file: %s\n", $tmpfname);
+} catch (\Exception $e) {
+    echo sprintf("%s: %s", get_class($e), $e->getMessage());
+}
diff --git a/examples/voice-recordings-list.php b/examples/voice-recordings-list.php
new file mode 100644
index 00000000..12f773f7
--- /dev/null
+++ b/examples/voice-recordings-list.php
@@ -0,0 +1,12 @@
+<?php
+
+require_once(__DIR__ . '/../autoload.php');
+
+$messageBird = new \MessageBird\Client('YOUR_ACCESS_KEY'); // Set your own API access key here.
+
+try {
+    $result = $messageBird->voiceRecordings->getList('c226420d-f107-4db1-b2f9-4646656a90bc', '4f5ab5f4-c4b6-4586-9255-980bb3fd7336', array('offset' => 100, 'limit' => 30)); // Set a call and leg id here
+    var_dump($result);
+} catch (\Exception $e) {
+    echo sprintf("%s: %s", get_class($e), $e->getMessage());
+}
diff --git a/examples/voice-recordings-read.php b/examples/voice-recordings-read.php
new file mode 100644
index 00000000..377cd6cf
--- /dev/null
+++ b/examples/voice-recordings-read.php
@@ -0,0 +1,12 @@
+<?php
+
+require_once(__DIR__ . '/../autoload.php');
+
+$messageBird = new \MessageBird\Client('YOUR_ACCESS_KEY'); // Set your own API access key here.
+
+try {
+    $result = $messageBird->voiceRecordings->read('c226420d-f107-4db1-b2f9-4646656a90bc', '4f5ab5f4-c4b6-4586-9255-980bb3fd7336', 'a94f7d51-19b5-4eb8-9e8e-90fce490a577'); // Set call, leg and recording id here
+    var_dump($result);
+} catch (\Exception $e) {
+    echo sprintf("%s: %s", get_class($e), $e->getMessage());
+}
diff --git a/examples/voice-transcriptions-create.php b/examples/voice-transcriptions-create.php
new file mode 100644
index 00000000..02965ccf
--- /dev/null
+++ b/examples/voice-transcriptions-create.php
@@ -0,0 +1,13 @@
+<?php
+
+require_once(__DIR__ . '/../autoload.php');
+
+$messageBird = new \MessageBird\Client('YOUR_ACCESS_KEY'); // Set your own API access key here.
+$transcription = new \MessageBird\Objects\Voice\Recording();
+
+try {
+    $result = $messageBird->voiceTranscriptions->create('c226420d-f107-4db1-b2f9-4646656a90bc', '4f5ab5f4-c4b6-4586-9255-980bb3fd7336', 'a94f7d51-19b5-4eb8-9e8e-90fce490a577');
+    var_dump($result);
+} catch (\Exception $e) {
+    echo sprintf("%s: %s", get_class($e), $e->getMessage());
+}
diff --git a/examples/voice-transcriptions-download.php b/examples/voice-transcriptions-download.php
new file mode 100644
index 00000000..1fa09883
--- /dev/null
+++ b/examples/voice-transcriptions-download.php
@@ -0,0 +1,13 @@
+<?php
+
+require_once(__DIR__ . '/../autoload.php');
+
+$messageBird = new \MessageBird\Client('YOUR_ACCESS_KEY'); // Set your own API access key here.
+
+try {
+    $data = $messageBird->voiceTranscriptions->download('c226420d-f107-4db1-b2f9-4646656a90bc', '4f5ab5f4-c4b6-4586-9255-980bb3fd7336', 'a94f7d51-19b5-4eb8-9e8e-90fce490a577', '44e73d1f-201d-4a7d-963a-9d76bbca6c4f'); // Set call, leg, recording and transcription id here
+    echo sprintf("Received %d bytes.\n", mb_strlen($data));
+    echo sprintf("Transcription contents: `%s`.\n", $data);
+} catch (\Exception $e) {
+    echo sprintf("%s: %s", get_class($e), $e->getMessage());
+}
diff --git a/examples/voice-transcriptions-list.php b/examples/voice-transcriptions-list.php
new file mode 100644
index 00000000..71e8bde4
--- /dev/null
+++ b/examples/voice-transcriptions-list.php
@@ -0,0 +1,12 @@
+<?php
+
+require_once(__DIR__ . '/../autoload.php');
+
+$messageBird = new \MessageBird\Client('YOUR_ACCESS_KEY'); // Set your own API access key here.
+
+try {
+    $result = $messageBird->voiceTranscriptions->getList('c226420d-f107-4db1-b2f9-4646656a90bc', '4f5ab5f4-c4b6-4586-9255-980bb3fd7336', 'a94f7d51-19b5-4eb8-9e8e-90fce490a577', array('offset' => 100, 'limit' => 30)); // Set a call and leg id here
+    var_dump($result);
+} catch (\Exception $e) {
+    echo sprintf("%s: %s", get_class($e), $e->getMessage());
+}
diff --git a/examples/voice-transcriptions-read.php b/examples/voice-transcriptions-read.php
new file mode 100644
index 00000000..8f272180
--- /dev/null
+++ b/examples/voice-transcriptions-read.php
@@ -0,0 +1,12 @@
+<?php
+
+require_once(__DIR__ . '/../autoload.php');
+
+$messageBird = new \MessageBird\Client('YOUR_ACCESS_KEY'); // Set your own API access key here.
+
+try {
+    $result = $messageBird->voiceTranscriptions->read('c226420d-f107-4db1-b2f9-4646656a90bc', '4f5ab5f4-c4b6-4586-9255-980bb3fd7336', 'a94f7d51-19b5-4eb8-9e8e-90fce490a577'); // Set call, leg, recording and transcription id here
+    var_dump($result);
+} catch (\Exception $e) {
+    echo sprintf("%s: %s", get_class($e), $e->getMessage());
+}
diff --git a/examples/voice-webhooks-create.php b/examples/voice-webhooks-create.php
new file mode 100644
index 00000000..2ff7ad5e
--- /dev/null
+++ b/examples/voice-webhooks-create.php
@@ -0,0 +1,15 @@
+<?php
+
+require_once(__DIR__ . '/../autoload.php');
+
+$messageBird = new \MessageBird\Client('YOUR_ACCESS_KEY'); // Set your own API access key here.
+$webhook = new \MessageBird\Objects\Voice\Webhook();
+$webhook->url = 'https://example.com/status';
+$webhook->token = 'foobar';
+
+try {
+    $result = $messageBird->voiceWebhooks->create($webhook);
+    var_dump($result);
+} catch (\Exception $e) {
+    echo sprintf("%s: %s", get_class($e), $e->getMessage());
+}
diff --git a/examples/voice-webhooks-delete.php b/examples/voice-webhooks-delete.php
new file mode 100644
index 00000000..2a7307d5
--- /dev/null
+++ b/examples/voice-webhooks-delete.php
@@ -0,0 +1,12 @@
+<?php
+
+require_once(__DIR__ . '/../autoload.php');
+
+$messageBird = new \MessageBird\Client('YOUR_ACCESS_KEY'); // Set your own API access key here.
+
+try {
+    $deleted = $messageBird->voiceWebhooks->delete('e5f56d49-4fa2-4802-895d-b0a306f73f76'); // Set a webhook id here
+    var_dump('Deleted: ' . $deleted);
+} catch (\Exception $e) {
+    echo sprintf("%s: %s", get_class($e), $e->getMessage());
+}
diff --git a/examples/voice-webhooks-list.php b/examples/voice-webhooks-list.php
new file mode 100644
index 00000000..452529aa
--- /dev/null
+++ b/examples/voice-webhooks-list.php
@@ -0,0 +1,12 @@
+<?php
+
+require_once(__DIR__ . '/../autoload.php');
+
+$messageBird = new \MessageBird\Client('YOUR_ACCESS_KEY'); // Set your own API access key here.
+
+try {
+    $result = $messageBird->voiceWebhooks->getList(array('offset' => 100, 'limit' => 30));
+    var_dump($result);
+} catch (\Exception $e) {
+    echo sprintf("%s: %s", get_class($e), $e->getMessage());
+}
diff --git a/examples/voice-webhooks-read.php b/examples/voice-webhooks-read.php
new file mode 100644
index 00000000..99718795
--- /dev/null
+++ b/examples/voice-webhooks-read.php
@@ -0,0 +1,12 @@
+<?php
+
+require_once(__DIR__ . '/../autoload.php');
+
+$messageBird = new \MessageBird\Client('YOUR_ACCESS_KEY'); // Set your own API access key here.
+
+try {
+    $result = $messageBird->voiceWebhooks->read('e5f56d49-4fa2-4802-895d-b0a306f73f76'); // Set a webhook id here
+    var_dump($result);
+} catch (\Exception $e) {
+    echo sprintf("%s: %s", get_class($e), $e->getMessage());
+}
diff --git a/examples/voice-webhooks-update.php b/examples/voice-webhooks-update.php
new file mode 100644
index 00000000..942a80e9
--- /dev/null
+++ b/examples/voice-webhooks-update.php
@@ -0,0 +1,15 @@
+<?php
+
+require_once(__DIR__ . '/../autoload.php');
+
+$messageBird = new \MessageBird\Client('YOUR_ACCESS_KEY'); // Set your own API access key here.
+$webhook = new \MessageBird\Objects\Voice\Webhook();
+$webhook->url = 'https://example.com/foobar';
+$webhook->token = 'baz';
+
+try {
+    $result = $messageBird->voiceWebhooks->update($webhook, 'e5f56d49-4fa2-4802-895d-b0a306f73f76');
+    var_dump($result);
+} catch (\Exception $e) {
+    echo sprintf("%s: %s", get_class($e), $e->getMessage());
+}
diff --git a/src/MessageBird/Client.php b/src/MessageBird/Client.php
index 88a0e022..c54c02f8 100644
--- a/src/MessageBird/Client.php
+++ b/src/MessageBird/Client.php
@@ -11,8 +11,9 @@ class Client
 {
     const ENDPOINT = 'https://rest.messagebird.com';
     const CHATAPI_ENDPOINT = 'https://chat.messagebird.com/1';
+    const VOICEAPI_ENDPOINT = 'https://voice.messagebird.com';
 
-    const CLIENT_VERSION = '1.8.0';
+    const CLIENT_VERSION = '1.9.0';
 
     /**
      * @var string
@@ -89,6 +90,36 @@ class Client
      */
     public $chatContacts;
 
+    /**
+     * @var Resources\Voice\Calls
+     */
+    public $voiceCalls;
+
+    /**
+     * @var Resources\Voice\CallFlows
+     */
+    public $voiceCallFlows;
+
+    /**
+     * @var Resources\Voice\Legs
+     */
+    public $voiceLegs;
+
+    /**
+     * @var Resources\Voice\Recordings
+     */
+    public $voiceRecordings;
+
+    /**
+     * @var Resources\Voice\Transcriptions
+     */
+    public $voiceTranscriptions;
+
+    /**
+     * @var Resources\Voice\Webhooks
+     */
+    public $voiceWebhooks;
+
     /**
      * @var Common\HttpClient
      */
@@ -99,6 +130,11 @@ class Client
      */
     protected $ChatAPIHttpClient;
 
+    /**
+     * @var Common\HttpClient
+     */
+    protected $VoiceAPIHttpClient;
+
     /**
      * @param string            $accessKey
      * @param Common\HttpClient $httpClient
@@ -108,9 +144,13 @@ public function __construct($accessKey = null, Common\HttpClient $httpClient = n
         if ($httpClient === null) {
             $this->ChatAPIHttpClient = new Common\HttpClient(self::CHATAPI_ENDPOINT);
             $this->HttpClient = new Common\HttpClient(self::ENDPOINT);
+            $this->VoiceAPIHttpClient = new Common\HttpClient(self::VOICEAPI_ENDPOINT, 10, 2, array(
+                'X-MessageBird-Version' => '20170314',
+           ));
         } else {
             $this->ChatAPIHttpClient = $httpClient;
             $this->HttpClient = $httpClient;
+            $this->VoiceAPIHttpClient = $httpClient;
         }
 
         $this->HttpClient->addUserAgentString('MessageBird/ApiClient/' . self::CLIENT_VERSION);
@@ -119,24 +159,33 @@ public function __construct($accessKey = null, Common\HttpClient $httpClient = n
         $this->ChatAPIHttpClient->addUserAgentString('MessageBird/ApiClient/' . self::CLIENT_VERSION);
         $this->ChatAPIHttpClient->addUserAgentString($this->getPhpVersion());
 
+        $this->VoiceAPIHttpClient->addUserAgentString('MessageBird/ApiClient/' . self::CLIENT_VERSION);
+        $this->VoiceAPIHttpClient->addUserAgentString($this->getPhpVersion());
+
         if ($accessKey !== null) {
             $this->setAccessKey($accessKey);
         }
 
-        $this->messages      = new Resources\Messages($this->HttpClient);
-        $this->hlr           = new Resources\Hlr($this->HttpClient);
-        $this->verify        = new Resources\Verify($this->HttpClient);
-        $this->balance       = new Resources\Balance($this->HttpClient);
-        $this->voicemessages = new Resources\VoiceMessage($this->HttpClient);
-        $this->lookup        = new Resources\Lookup($this->HttpClient);
-        $this->lookupHlr     = new Resources\LookupHlr($this->HttpClient);
-        $this->mmsMessages   = new Resources\MmsMessages($this->HttpClient);
-        $this->contacts      = new Resources\Contacts($this->HttpClient);
-        $this->groups        = new Resources\Groups($this->HttpClient);
-        $this->chatMessages  = new Resources\Chat\Message($this->ChatAPIHttpClient);
-        $this->chatChannels  = new Resources\Chat\Channel($this->ChatAPIHttpClient);
-        $this->chatPlatforms = new Resources\Chat\Platform($this->ChatAPIHttpClient);
-        $this->chatContacts  = new Resources\Chat\Contact($this->ChatAPIHttpClient);
+        $this->messages            = new Resources\Messages($this->HttpClient);
+        $this->hlr                 = new Resources\Hlr($this->HttpClient);
+        $this->verify              = new Resources\Verify($this->HttpClient);
+        $this->balance             = new Resources\Balance($this->HttpClient);
+        $this->voicemessages       = new Resources\VoiceMessage($this->HttpClient);
+        $this->lookup              = new Resources\Lookup($this->HttpClient);
+        $this->lookupHlr           = new Resources\LookupHlr($this->HttpClient);
+        $this->chatMessages        = new Resources\Chat\Message($this->ChatAPIHttpClient);
+        $this->chatChannels        = new Resources\Chat\Channel($this->ChatAPIHttpClient);
+        $this->chatPlatforms       = new Resources\Chat\Platform($this->ChatAPIHttpClient);
+        $this->chatContacts        = new Resources\Chat\Contact($this->ChatAPIHttpClient);
+        $this->voiceCallFlows      = new Resources\Voice\CallFlows($this->VoiceAPIHttpClient);
+        $this->voiceCalls          = new Resources\Voice\Calls($this->VoiceAPIHttpClient);
+        $this->voiceLegs           = new Resources\Voice\Legs($this->VoiceAPIHttpClient);
+        $this->voiceRecordings     = new Resources\Voice\Recordings($this->VoiceAPIHttpClient);
+        $this->voiceTranscriptions = new Resources\Voice\Transcriptions($this->VoiceAPIHttpClient);
+        $this->voiceWebhooks       = new Resources\Voice\Webhooks($this->VoiceAPIHttpClient);
+        $this->mmsMessages         = new Resources\MmsMessages($this->HttpClient);
+        $this->contacts            = new Resources\Contacts($this->HttpClient);
+        $this->groups              = new Resources\Groups($this->HttpClient);
     }
 
     /**
@@ -148,6 +197,7 @@ public function setAccessKey ($accessKey)
 
         $this->ChatAPIHttpClient->setAuthentication($Authentication);
         $this->HttpClient->setAuthentication($Authentication);
+        $this->VoiceAPIHttpClient->setAuthentication($Authentication);
     }
 
     /**
diff --git a/src/MessageBird/Common/HttpClient.php b/src/MessageBird/Common/HttpClient.php
index 687f6a32..d37742bd 100644
--- a/src/MessageBird/Common/HttpClient.php
+++ b/src/MessageBird/Common/HttpClient.php
@@ -45,14 +45,18 @@ class HttpClient
      */
     private $connectionTimeout = 2;
 
+    /**
+     * @var array
+     */
+    private $headers = array();
+
     /**
      * @param string $endpoint
-     * @param int $timeout > 0
-     * @param int $connectionTimeout >= 0
-     *
-     * @throws \InvalidArgumentException if timeout settings are invalid
+     * @param int    $timeout           > 0
+     * @param int    $connectionTimeout >= 0
+     * @param array  $headers
      */
-    public function __construct($endpoint, $timeout = 10, $connectionTimeout = 2)
+    public function __construct($endpoint, $timeout = 10, $connectionTimeout = 2, $headers = array())
     {
         $this->endpoint = $endpoint;
 
@@ -73,6 +77,7 @@ public function __construct($endpoint, $timeout = 10, $connectionTimeout = 2)
         }
 
         $this->connectionTimeout = $connectionTimeout;
+        $this->headers = $headers;
     }
 
     /**
@@ -110,6 +115,14 @@ public function getRequestUrl($resourceName, $query)
         return $requestUrl;
     }
 
+    /**
+     * @param array $headers
+     */
+    public function setHeaders(array $headers)
+    {
+        $this->headers = $headers;
+    }
+
     /**
      * @param string      $method
      * @param string      $resourceName
@@ -137,6 +150,8 @@ public function performHttpRequest($method, $resourceName, $query = null, $body
             sprintf('Authorization: AccessKey %s', $this->Authentication->accessKey)
         );
 
+        $headers = array_merge($headers, $this->headers);
+
         curl_setopt($curl, CURLOPT_HTTPHEADER, $headers);
         curl_setopt($curl, CURLOPT_HEADER, true);
         curl_setopt($curl, CURLOPT_URL, $this->getRequestUrl($resourceName, $query));
diff --git a/src/MessageBird/Common/ResponseError.php b/src/MessageBird/Common/ResponseError.php
index 2b39c33d..687c78b0 100644
--- a/src/MessageBird/Common/ResponseError.php
+++ b/src/MessageBird/Common/ResponseError.php
@@ -49,6 +49,12 @@ public function __construct($body)
                     throw new Exceptions\AuthenticateException;
                 }
 
+                // Rewrite error for Voice API.
+                if (!empty($error->message)) {
+                    $error->description = $error->message;
+                    unset($error->message);
+                }
+
                 $this->errors[] = $error;
             }
         }
diff --git a/src/MessageBird/Objects/Contact.php b/src/MessageBird/Objects/Contact.php
index 360833ac..281fd8b2 100644
--- a/src/MessageBird/Objects/Contact.php
+++ b/src/MessageBird/Objects/Contact.php
@@ -3,8 +3,6 @@
 
 namespace MessageBird\Objects;
 
-use MessageBird\Resources\Groups;
-
 /**
  * Class Contact
  *
diff --git a/src/MessageBird/Objects/Voice/BaseList.php b/src/MessageBird/Objects/Voice/BaseList.php
new file mode 100644
index 00000000..79cacd95
--- /dev/null
+++ b/src/MessageBird/Objects/Voice/BaseList.php
@@ -0,0 +1,21 @@
+<?php
+
+namespace MessageBird\Objects\Voice;
+
+use MessageBird\Objects\Base;
+
+/**
+ * Class BaseList
+ *
+ * @package MessageBird\Objects\Voice
+ */
+class BaseList extends Base
+{
+
+    public $totalCount;
+    public $pageCount;
+    public $currentPage;
+    public $perPage;
+
+    public $items = array ();
+}
diff --git a/src/MessageBird/Objects/Voice/Call.php b/src/MessageBird/Objects/Voice/Call.php
new file mode 100644
index 00000000..b3ca3746
--- /dev/null
+++ b/src/MessageBird/Objects/Voice/Call.php
@@ -0,0 +1,86 @@
+<?php
+
+namespace MessageBird\Objects\Voice;
+
+use MessageBird\Objects\Base;
+
+class Call extends Base
+{
+    /**
+     * The unique ID of the call
+     *
+     * @var string
+     */
+    protected $id;
+
+    /**
+     * The caller ID of the call
+     *
+     * @var string
+     */
+    public $source;
+
+    /**
+     * The number/address to be called.
+     *
+     * @var string
+     */
+    public $destination;
+
+    /**
+     * The call flow object to be executed when the call is answered.
+     *
+     * @var CallFlow
+     */
+    public $callFlow;
+
+    /**
+     * The unique ID of the number that is/was called
+     *
+     * @var string
+     */
+    protected $numberId;
+
+    /**
+     * The status of the call. Possible values: starting, ongoing, ended.
+     *
+     * @var string
+     */
+    protected $status;
+
+    /**
+     * The date and time the call was created
+     *
+     * @var string
+     */
+    protected $createdAt;
+
+    /**
+     * The date and time the call was last updated
+     *
+     * @var string
+     */
+    protected $updatedAt;
+
+    /**
+     * The date and time the call ended
+     *
+     * @var string
+     */
+    protected $endedAt;
+
+    /**
+     * @inheritdoc
+     */
+    public function loadFromArray($object)
+    {
+        parent::loadFromArray($object);
+
+        if (!empty($this->callFlow)) {
+            $callFlow = new CallFlow();
+            $this->callFlow = $callFlow->loadFromArray($this->callFlow);
+        }
+
+        return $this;
+    }
+}
diff --git a/src/MessageBird/Objects/Voice/CallFlow.php b/src/MessageBird/Objects/Voice/CallFlow.php
new file mode 100644
index 00000000..d68bb5b8
--- /dev/null
+++ b/src/MessageBird/Objects/Voice/CallFlow.php
@@ -0,0 +1,67 @@
+<?php
+
+namespace MessageBird\Objects\Voice;
+
+use MessageBird\Objects\Base;
+
+class CallFlow extends Base
+{
+
+    /**
+     * The unique ID of the call
+     *
+     * @var string
+     */
+    protected $id;
+
+    /**
+     * The title of the call flow
+     *
+     * @var string
+     */
+    public $title;
+
+    /**
+     * An array of step objects.
+     *
+     * The sequence of the array items describe the order of execution, where the first item will be executed first,
+     * than the second, etcetera.
+     *
+     * @var Step[]
+     */
+    public $steps;
+
+    /**
+     * The date and time the call flow was created
+     *
+     * @var string
+     */
+    protected $createdAt;
+
+    /**
+     * The date and time the call flow was last updated
+     *
+     * @var string
+     */
+    protected $updatedAt;
+
+    /**
+     * @inheritdoc
+     */
+    public function loadFromArray($object)
+    {
+        parent::loadFromArray($object);
+
+        if (!empty($this->steps)) {
+            foreach ($this->steps as &$item) {
+                $step = new Step();
+                $step->loadFromArray($item);
+                $step->options = (array) $step->options;
+
+                $item = $step;
+            }
+        }
+
+        return $this;
+    }
+}
diff --git a/src/MessageBird/Objects/Voice/Leg.php b/src/MessageBird/Objects/Voice/Leg.php
new file mode 100644
index 00000000..caa35c73
--- /dev/null
+++ b/src/MessageBird/Objects/Voice/Leg.php
@@ -0,0 +1,79 @@
+<?php
+
+namespace MessageBird\Objects\Voice;
+
+use MessageBird\Objects\Base;
+
+class Leg extends Base
+{
+    /**
+     * The unique ID of the leg
+     *
+     * @var string
+     */
+    protected $id;
+
+    /**
+     * The unique ID of the call that this leg belongs to
+     *
+     * @var string
+     */
+    protected $callId;
+
+    /**
+     * The number/SIP URL that is making the connection
+     *
+     * @var string
+     */
+    protected $source;
+
+    /**
+     * The number/SIP URL that a connection is made to
+     *
+     * @var string
+     */
+    protected $destination;
+
+    /**
+     * The status of the leg. Possible values: ongoing, hangup
+     *
+     * @var string
+     */
+    protected $status;
+
+    /**
+     * The direction of the leg, indicating if it's an incoming connection or outgoing (e.g. for transfering a call).
+     * Possible values: incoming, outgoing.
+     *
+     * @var string
+     */
+    protected $direction;
+
+    /**
+     * The date and time the leg was created
+     *
+     * @var string
+     */
+    protected $createdAt;
+
+    /**
+     * The date and time the leg was last updated
+     *
+     * @var string
+     */
+    protected $updatedAt;
+
+    /**
+     * The date and time the leg was answered at
+     *
+     * @var string
+     */
+    protected $answeredAt;
+
+    /**
+     * The date and time the leg ended
+     *
+     * @var string
+     */
+    protected $endedAt;
+}
diff --git a/src/MessageBird/Objects/Voice/Recording.php b/src/MessageBird/Objects/Voice/Recording.php
new file mode 100644
index 00000000..680102e4
--- /dev/null
+++ b/src/MessageBird/Objects/Voice/Recording.php
@@ -0,0 +1,50 @@
+<?php
+
+namespace MessageBird\Objects\Voice;
+
+use MessageBird\Objects\Base;
+
+class Recording extends Base
+{
+    /**
+     * The unique ID of the recording
+     *
+     * @var string
+     */
+    protected $id;
+
+    /**
+     * The ID of the leg that this recording belongs to
+     *
+     * @var string
+     */
+    protected $legId;
+
+    /**
+     * The status of the recording. Possible values: initialised, queued, recording, paused, done, failed, canceled
+     *
+     * @var string
+     */
+    protected $status;
+
+    /**
+     * The duration of the recording in seconds.
+     *
+     * @var int
+     */
+    protected $duration;
+
+    /**
+     * The date and time the recording was created
+     *
+     * @var string
+     */
+    protected $createdAt;
+
+    /**
+     * The date and time the recording was last updated
+     *
+     * @var string
+     */
+    protected $updatedAt;
+}
diff --git a/src/MessageBird/Objects/Voice/Step.php b/src/MessageBird/Objects/Voice/Step.php
new file mode 100644
index 00000000..cb7609c7
--- /dev/null
+++ b/src/MessageBird/Objects/Voice/Step.php
@@ -0,0 +1,32 @@
+<?php
+
+namespace MessageBird\Objects\Voice;
+
+use MessageBird\Objects\Base;
+
+class Step extends Base
+{
+    /**
+     * The unique (within the call flow) identifier of the step.
+     *
+     * @var string
+     */
+    protected $id;
+
+    /**
+     * The name of the VoIP action
+     *
+     * Possible values: transfer, say, play, pause, record, fetchCallFlow, hangup.
+     *
+     * @var string
+     */
+    public $action;
+
+    /**
+     * Contains zero or more key-value pairs, where the key is the identifier of the option and value is the option
+     * value.
+     *
+     * @var array
+     */
+    public $options;
+}
diff --git a/src/MessageBird/Objects/Voice/Transcription.php b/src/MessageBird/Objects/Voice/Transcription.php
new file mode 100644
index 00000000..530edcf9
--- /dev/null
+++ b/src/MessageBird/Objects/Voice/Transcription.php
@@ -0,0 +1,43 @@
+<?php
+
+namespace MessageBird\Objects\Voice;
+
+use MessageBird\Objects\Base;
+
+class Transcription extends Base
+{
+    /**
+     * The unique ID of the transcription
+     *
+     * @var string
+     */
+    protected $id;
+
+    /**
+     * The ID of the recording that this transcription belongs to
+     *
+     * @var string
+     */
+    protected $recordingId;
+
+    /**
+     * In case that an error was occurred while executing the transcription request, it appears here
+     *
+     * @var string
+     */
+    protected $error;
+
+    /**
+     * The date and time the transcription was created
+     *
+     * @var string
+     */
+    protected $createdAt;
+
+    /**
+     * The date and time the transcription was last updated
+     *
+     * @var string
+     */
+    protected $updatedAt;
+}
diff --git a/src/MessageBird/Objects/Voice/Webhook.php b/src/MessageBird/Objects/Voice/Webhook.php
new file mode 100644
index 00000000..6874b302
--- /dev/null
+++ b/src/MessageBird/Objects/Voice/Webhook.php
@@ -0,0 +1,44 @@
+<?php
+
+namespace MessageBird\Objects\Voice;
+
+use MessageBird\Objects\Base;
+
+class Webhook extends Base
+{
+    /**
+     * The unique ID of the webhook
+     *
+     * @var string
+     */
+    protected $id;
+
+    /**
+     * The callback URL that will be requested when the MessageBird platform sends a webhook.
+     *
+     * @var string
+     */
+    public $url;
+
+    /**
+     * The secret used for signing webhook requests.
+     *
+     * @var string
+     * @see https://developers.messagebird.com/docs/voice-calling#handle-callbacks
+     */
+    public $token;
+
+    /**
+     * The date and time the webhook was created
+     *
+     * @var string
+     */
+    protected $createdAt;
+
+    /**
+     * The date and time the webhook was last updated
+     *
+     * @var string
+     */
+    protected $updatedAt;
+}
diff --git a/src/MessageBird/Resources/Contacts.php b/src/MessageBird/Resources/Contacts.php
index 3efa8392..54e5d8ea 100644
--- a/src/MessageBird/Resources/Contacts.php
+++ b/src/MessageBird/Resources/Contacts.php
@@ -3,7 +3,6 @@
 namespace MessageBird\Resources;
 
 use MessageBird\Objects;
-use MessageBird\Exceptions;
 use MessageBird\Common;
 use InvalidArgumentException;
 
diff --git a/src/MessageBird/Resources/Voice/Base.php b/src/MessageBird/Resources/Voice/Base.php
new file mode 100644
index 00000000..f092a865
--- /dev/null
+++ b/src/MessageBird/Resources/Voice/Base.php
@@ -0,0 +1,66 @@
+<?php
+
+namespace MessageBird\Resources\Voice;
+
+use MessageBird\Common;
+use MessageBird\Exceptions;
+use MessageBird\Objects\Voice\BaseList;
+
+/**
+ * Class Base
+ *
+ * @package MessageBird\Resources\Voice
+ */
+class Base extends \MessageBird\Resources\Base
+{
+    public function getList($parameters = array())
+    {
+        list($status, , $body) = $this->HttpClient->performHttpRequest(
+            Common\HttpClient::REQUEST_GET,
+            $this->resourceName,
+            $parameters
+        );
+
+        if ($status === 200) {
+            $body = json_decode($body);
+
+            $data = $body->data;
+
+            $baseList = new BaseList();
+            if (property_exists($body, 'pagination')) {
+                $baseList->loadFromArray($body->pagination);
+            }
+
+            $objectName = $this->Object;
+
+            foreach ($data as $item) {
+                $itemObject = new $objectName($this->HttpClient);
+
+                $Message = $itemObject->loadFromArray($item);
+                $baseList->items[] = $Message;
+            }
+            return $baseList;
+        }
+
+        return $this->processRequest($body);
+    }
+
+    /**
+     * @inheritdoc
+     */
+    public function processRequest($body)
+    {
+        $body = @json_decode($body);
+
+        if ($body === null or $body === false) {
+            throw new Exceptions\ServerException('Got an invalid JSON response from the server.');
+        }
+
+        if (empty($body->errors)) {
+            return $this->Object->loadFromArray($body->data[0]);
+        }
+
+        $ResponseError = new Common\ResponseError($body);
+        throw new Exceptions\RequestException($ResponseError->getErrorString());
+    }
+}
diff --git a/src/MessageBird/Resources/Voice/CallFlows.php b/src/MessageBird/Resources/Voice/CallFlows.php
new file mode 100644
index 00000000..5ba537b1
--- /dev/null
+++ b/src/MessageBird/Resources/Voice/CallFlows.php
@@ -0,0 +1,27 @@
+<?php
+
+namespace MessageBird\Resources\Voice;
+
+use MessageBird\Common;
+use MessageBird\Objects;
+
+/**
+ * Class CallFlows
+ *
+ * @package MessageBird\Resources\Voice
+ */
+class CallFlows extends Base
+{
+
+    /**
+     * @param Common\HttpClient $HttpClient
+     */
+    public function __construct(Common\HttpClient $HttpClient)
+    {
+
+        $this->setObject(new Objects\Voice\CallFlow());
+        $this->setResourceName('call-flows');
+
+        parent::__construct($HttpClient);
+    }
+}
diff --git a/src/MessageBird/Resources/Voice/Calls.php b/src/MessageBird/Resources/Voice/Calls.php
new file mode 100644
index 00000000..e4330f7f
--- /dev/null
+++ b/src/MessageBird/Resources/Voice/Calls.php
@@ -0,0 +1,27 @@
+<?php
+
+namespace MessageBird\Resources\Voice;
+
+use MessageBird\Common;
+use MessageBird\Objects;
+
+/**
+ * Class Calls
+ *
+ * @package MessageBird\Resources\Voice
+ */
+class Calls extends Base
+{
+
+    /**
+     * @param Common\HttpClient $HttpClient
+     */
+    public function __construct(Common\HttpClient $HttpClient)
+    {
+
+        $this->setObject(new Objects\Voice\Call());
+        $this->setResourceName('calls');
+
+        parent::__construct($HttpClient);
+    }
+}
diff --git a/src/MessageBird/Resources/Voice/Legs.php b/src/MessageBird/Resources/Voice/Legs.php
new file mode 100644
index 00000000..e7eb91dc
--- /dev/null
+++ b/src/MessageBird/Resources/Voice/Legs.php
@@ -0,0 +1,123 @@
+<?php
+
+namespace MessageBird\Resources\Voice;
+
+use MessageBird\Common;
+use MessageBird\Exceptions;
+use MessageBird\Objects;
+
+/**
+ * Class Legs
+ *
+ * @package MessageBird\Resources\Voice
+ */
+class Legs
+{
+    /**
+     * @var \MessageBird\Common\HttpClient
+     */
+    protected $HttpClient;
+
+    /**
+     * @var Objects\Voice\Leg
+     */
+    protected $Object;
+
+    /**
+     * @param Common\HttpClient $HttpClient
+     */
+    public function __construct(Common\HttpClient $HttpClient)
+    {
+        $this->HttpClient = $HttpClient;
+        $this->setObject(new Objects\Voice\Leg());
+    }
+
+    /**
+     * @param $Object
+     */
+    public function setObject($Object)
+    {
+        $this->Object = $Object;
+    }
+
+    /**
+     * @return Objects\Voice\Leg
+     */
+    public function getObject()
+    {
+        return $this->Object;
+    }
+
+    /**
+     * @param string      $callId
+     * @param array $parameters
+     *
+     * @return Objects\Voice\Leg
+     */
+    public function getList($callId, $parameters = array())
+    {
+        list($status, , $body) = $this->HttpClient->performHttpRequest(
+            Common\HttpClient::REQUEST_GET,
+            "calls/$callId/legs",
+            $parameters
+        );
+
+        if ($status === 200) {
+            $body = json_decode($body);
+
+            $items = $body->data;
+            unset($body->data);
+
+            $baseList = new Objects\BaseList();
+            $baseList->loadFromArray($body);
+
+            $objectName = $this->Object;
+
+            foreach ($items as $item) {
+                $object = new $objectName($this->HttpClient);
+
+                $itemObject = $object->loadFromArray($item);
+                $baseList->items[] = $itemObject;
+            }
+            return $baseList;
+        }
+
+        return $this->processRequest($body);
+    }
+
+    /**
+     * @param string $callId
+     * @param string $legId
+     *
+     * @return $this->Object
+     */
+    public function read($callId, $legId)
+    {
+        list(, , $body) = $this->HttpClient->performHttpRequest(Common\HttpClient::REQUEST_GET, "calls/$callId/legs/$legId");
+
+        return $this->processRequest($body);
+    }
+
+    /**
+     * @param string $body
+     *
+     * @return Objects\Voice\Leg
+     * @throws \MessageBird\Exceptions\RequestException
+     * @throws \MessageBird\Exceptions\ServerException
+     */
+    public function processRequest($body)
+    {
+        $body = @json_decode($body);
+
+        if ($body === null or $body === false) {
+            throw new Exceptions\ServerException('Got an invalid JSON response from the server.');
+        }
+
+        if (empty($body->errors)) {
+            return $this->Object->loadFromArray($body->data[0]);
+        }
+
+        $ResponseError = new Common\ResponseError($body);
+        throw new Exceptions\RequestException($ResponseError->getErrorString());
+    }
+}
diff --git a/src/MessageBird/Resources/Voice/Recordings.php b/src/MessageBird/Resources/Voice/Recordings.php
new file mode 100644
index 00000000..3138fc99
--- /dev/null
+++ b/src/MessageBird/Resources/Voice/Recordings.php
@@ -0,0 +1,141 @@
+<?php
+
+namespace MessageBird\Resources\Voice;
+
+use MessageBird\Common;
+use MessageBird\Exceptions;
+use MessageBird\Objects;
+
+/**
+ * Class Recordings
+ *
+ * @package MessageBird\Resources\Voice
+ */
+class Recordings
+{
+    /**
+     * @var \MessageBird\Common\HttpClient
+     */
+    protected $HttpClient;
+
+    /**
+     * @var Objects\Voice\Recording
+     */
+    protected $Object;
+
+    /**
+     * @param Common\HttpClient $HttpClient
+     */
+    public function __construct(Common\HttpClient $HttpClient)
+    {
+        $this->HttpClient = $HttpClient;
+        $this->setObject(new Objects\Voice\Recording());
+    }
+
+    /**
+     * @param $Object
+     */
+    public function setObject($Object)
+    {
+        $this->Object = $Object;
+    }
+
+    /**
+     * @return Objects\Voice\Recording
+     */
+    public function getObject()
+    {
+        return $this->Object;
+    }
+
+    /**
+     * @param string $callId
+     * @param string $legId
+     * @param array  $parameters
+     *
+     * @return Objects\Voice\Recording
+     */
+    public function getList($callId, $legId, $parameters = array())
+    {
+        list($status, , $body) = $this->HttpClient->performHttpRequest(
+            Common\HttpClient::REQUEST_GET,
+            "calls/$callId/legs/$legId/recordings",
+            $parameters
+        );
+
+        if ($status === 200) {
+            $body = json_decode($body);
+
+            $items = $body->data;
+            unset($body->data);
+
+            $baseList = new Objects\BaseList();
+            $baseList->loadFromArray($body);
+
+            $objectName = $this->Object;
+
+            foreach ($items as $item) {
+                $object = new $objectName($this->HttpClient);
+
+                $itemObject = $object->loadFromArray($item);
+                $baseList->items[] = $itemObject;
+            }
+            return $baseList;
+        }
+
+        return $this->processRequest($body);
+    }
+
+    /**
+     * @param string $callId
+     * @param string $legId
+     *
+     * @return $this->Object
+     */
+    public function read($callId, $legId, $recordingId)
+    {
+        list(, , $body) = $this->HttpClient->performHttpRequest(Common\HttpClient::REQUEST_GET, "calls/$callId/legs/$legId/recordings/$recordingId");
+
+        return $this->processRequest($body);
+    }
+
+    /**
+     * @param string $callId
+     * @param string $legId
+     *
+     * @return self|string
+     */
+    public function download($callId, $legId, $recordingId)
+    {
+        list($status, , $body) = $this->HttpClient->performHttpRequest(Common\HttpClient::REQUEST_GET, "calls/$callId/legs/$legId/recordings/$recordingId.wav");
+
+        if ($status !== 200) {
+            return $this->processRequest($body);
+        }
+
+        return $body;
+    }
+
+    /**
+     * @param string $body
+     *
+     * @return Objects\Voice\Recording
+     * @throws \MessageBird\Exceptions\RequestException
+     * @throws \MessageBird\Exceptions\ServerException
+     */
+    public function processRequest($body)
+    {
+        $body = @json_decode($body);
+
+        if ($body === null or $body === false) {
+            throw new Exceptions\ServerException('Got an invalid JSON response from the server.');
+        }
+
+        if (empty($body->errors)) {
+            return $this->Object->loadFromArray($body->data[0]);
+        }
+
+        $ResponseError = new Common\ResponseError($body);
+        throw new Exceptions\RequestException($ResponseError->getErrorString());
+    }
+}
diff --git a/src/MessageBird/Resources/Voice/Transcriptions.php b/src/MessageBird/Resources/Voice/Transcriptions.php
new file mode 100644
index 00000000..d49a4bf3
--- /dev/null
+++ b/src/MessageBird/Resources/Voice/Transcriptions.php
@@ -0,0 +1,164 @@
+<?php
+
+namespace MessageBird\Resources\Voice;
+
+use MessageBird\Common;
+use MessageBird\Exceptions;
+use MessageBird\Objects;
+
+/**
+ * Class Transcriptions
+ *
+ * @package MessageBird\Resources\Voice
+ */
+class Transcriptions
+{
+    /**
+     * @var \MessageBird\Common\HttpClient
+     */
+    protected $HttpClient;
+
+    /**
+     * @var Objects\Voice\Transcription
+     */
+    protected $Object;
+
+    /**
+     * @param Common\HttpClient $HttpClient
+     */
+    public function __construct(Common\HttpClient $HttpClient)
+    {
+        $this->HttpClient = $HttpClient;
+        $this->setObject(new Objects\Voice\Transcription());
+    }
+
+    /**
+     * @param $Object
+     */
+    public function setObject($Object)
+    {
+        $this->Object = $Object;
+    }
+
+    /**
+     * @return Objects\Voice\Transcription
+     */
+    public function getObject()
+    {
+        return $this->Object;
+    }
+
+    /**
+     * @param string                      $callId
+     * @param string                      $legId
+     * @param string                      $recordingId
+     *
+     * @return Objects\Voice\Transcription
+     */
+    public function create($callId, $legId, $recordingId)
+    {
+        list(, , $body) = $this->HttpClient->performHttpRequest(
+            Common\HttpClient::REQUEST_POST,
+            "calls/$callId/legs/$legId/recordings/$recordingId/transcriptions"
+        );
+        return $this->processRequest($body);
+    }
+
+    /**
+     * @param string $callId
+     * @param string $legId
+     * @param string $recordingId
+     * @param array  $parameters
+     *
+     * @return Objects\Voice\Transcription
+     */
+    public function getList($callId, $legId, $recordingId, $parameters = array())
+    {
+        list($status, , $body) = $this->HttpClient->performHttpRequest(
+            Common\HttpClient::REQUEST_GET,
+            "calls/$callId/legs/$legId/recordings/$recordingId/transcriptions",
+            $parameters
+        );
+
+        if ($status === 200) {
+            $body = json_decode($body);
+
+            $items = $body->data;
+            unset($body->data);
+
+            $baseList = new Objects\BaseList();
+            $baseList->loadFromArray($body);
+
+            $objectName = $this->Object;
+
+            foreach ($items as $item) {
+                $object = new $objectName($this->HttpClient);
+
+                $itemObject = $object->loadFromArray($item);
+                $baseList->items[] = $itemObject;
+            }
+            return $baseList;
+        }
+
+        return $this->processRequest($body);
+    }
+
+    /**
+     * @param string $callId string
+     * @param string $legId  string
+     * @param string $recordingId
+     * @param string $transcriptionId
+     *
+     * @return $this ->Object
+     */
+    public function read($callId, $legId, $recordingId, $transcriptionId)
+    {
+        list(, , $body) = $this->HttpClient->performHttpRequest(Common\HttpClient::REQUEST_GET,
+            "calls/$callId/legs/$legId/recordings/$recordingId/transcriptions/$transcriptionId");
+
+        return $this->processRequest($body);
+    }
+
+    /**
+     * @param string $callId string
+     * @param string $legId  string
+     * @param string $recordingId
+     * @param string $transcriptionId
+     *
+     * @return self|string
+     */
+    public function download($callId, $legId, $recordingId, $transcriptionId)
+    {
+        list($status, , $body) = $this->HttpClient->performHttpRequest(Common\HttpClient::REQUEST_GET,
+            "calls/$callId/legs/$legId/recordings/$recordingId/transcriptions/$transcriptionId.txt");
+
+        if ($status !== 200) {
+            return $this->processRequest($body);
+        }
+
+        return $body;
+    }
+
+    /**
+     * @param string $body
+     *
+     * @return Objects\Voice\Transcription
+     * @throws \MessageBird\Exceptions\RequestException
+     * @throws \MessageBird\Exceptions\ServerException
+     */
+    public function processRequest($body)
+    {
+        $body = @json_decode($body);
+
+        if ($body === null or $body === false) {
+            throw new Exceptions\ServerException('Got an invalid JSON response from the server.');
+        }
+
+        if (empty($body->errors)) {
+            return $this->Object->loadFromArray($body->data[0]);
+        }
+
+        $ResponseError = new Common\ResponseError($body);
+        throw new Exceptions\RequestException($ResponseError->getErrorString());
+    }
+}
diff --git a/src/MessageBird/Resources/Voice/Webhooks.php b/src/MessageBird/Resources/Voice/Webhooks.php
new file mode 100644
index 00000000..57a3284e
--- /dev/null
+++ b/src/MessageBird/Resources/Voice/Webhooks.php
@@ -0,0 +1,27 @@
+<?php
+
+namespace MessageBird\Resources\Voice;
+
+use MessageBird\Common;
+use MessageBird\Objects;
+
+/**
+ * Class Webhooks
+ *
+ * @package MessageBird\Resources\Voice
+ */
+class Webhooks extends Base
+{
+
+    /**
+     * @param Common\HttpClient $HttpClient
+     */
+    public function __construct(Common\HttpClient $HttpClient)
+    {
+
+        $this->setObject(new Objects\Voice\Webhook());
+        $this->setResourceName('webhooks');
+
+        parent::__construct($HttpClient);
+    }
+}
diff --git a/tests/integration/voice/VoiceTest.php b/tests/integration/voice/VoiceTest.php
new file mode 100644
index 00000000..4bbbfb58
--- /dev/null
+++ b/tests/integration/voice/VoiceTest.php
@@ -0,0 +1,364 @@
+<?php
+
+class VoiceTest extends BaseTest
+{
+    /** @var \MessageBird\Client client */
+    public $client;
+
+    public function setUp()
+    {
+        parent::setUp();
+        $this->client = new \MessageBird\Client('YOUR_ACCESS_KEY', $this->mockClient);
+    }
+
+    /**
+     * @expectedException MessageBird\Exceptions\ServerException
+     */
+    public function testListVoiceCall()
+    {
+        $this->mockClient->expects($this->once())->method('performHttpRequest')->with("GET", 'calls', array(
+            'offset' => 100,
+            'limit' => 30,
+        ), null);
+        $this->client->voiceCalls->getList(array('offset' => 100, 'limit' => 30));
+    }
+
+    /**
+     * @expectedException MessageBird\Exceptions\ServerException
+     */
+    public function testReadVoiceCall()
+    {
+        $this->mockClient->expects($this->once())->method('performHttpRequest')->with("GET", 'calls/foobar', null, null);
+        $this->client->voiceCalls->read('foobar');
+    }
+
+    public function testCreateVoiceCall()
+    {
+        $voiceCall = new \MessageBird\Objects\Voice\Call();
+        $voiceCall->source = '31612354678';
+        $voiceCall->destination = '31611223344';
+        $voiceCall->callFlow = array(
+            'title' => 'Foobar',
+            'steps' => array(
+                array(
+                    'action' => 'hangup',
+                ),
+            ),
+        );
+
+        $this->mockClient->expects($this->atLeastOnce())->method('performHttpRequest')->willReturn(array(201, '', '{
+  "data": [
+    {
+      "id": "21025ed1-cc1d-4554-ac05-043fa6c84e00",
+      "status": "starting",
+      "source": "31644556677",
+      "destination": "31612345678",
+      "createdAt": "2017-08-30T07:35:37Z",
+      "updatedAt": "2017-08-30T07:35:37Z",
+      "endedAt": null
+    }
+  ],
+  "_links": {
+    "self": "/calls/21025ed1-cc1d-4554-ac05-043fa6c84e00"
+  }
+}'));
+        $this->mockClient->expects($this->once())->method('performHttpRequest')->with("POST", 'calls', null, '{"source":"31612354678","destination":"31611223344","callFlow":{"title":"Foobar","steps":[{"action":"hangup"}]}}');
+        $this->client->voiceCalls->create($voiceCall);
+    }
+
+    /**
+     * @expectedException MessageBird\Exceptions\ServerException
+     */
+    public function testListVoiceLegs()
+    {
+        $this->mockClient->expects($this->once())->method('performHttpRequest')->with("GET", 'calls/foobar/legs', array(
+            'offset' => 100,
+            'limit' => 30,
+        ), null);
+        $this->client->voiceLegs->getList('foobar', array('offset' => 100, 'limit' => 30));
+    }
+
+    /**
+     * @expectedException MessageBird\Exceptions\ServerException
+     */
+    public function testReadVoiceLeg()
+    {
+        $this->mockClient->expects($this->once())->method('performHttpRequest')->with("GET", 'calls/foo/legs/bar', null, null);
+        $this->client->voiceLegs->read('foo', 'bar');
+    }
+
+    /**
+     * @expectedException MessageBird\Exceptions\ServerException
+     */
+    public function testListVoiceRecordings()
+    {
+        $this->mockClient->expects($this->once())->method('performHttpRequest')->with("GET", 'calls/foo/legs/bar/recordings', array(
+            'offset' => 100,
+            'limit' => 30,
+        ), null);
+        $this->client->voiceRecordings->getList('foo', 'bar', array('offset' => 100, 'limit' => 30));
+    }
+
+    /**
+     * @expectedException MessageBird\Exceptions\ServerException
+     */
+    public function testReadVoiceRecording()
+    {
+        $this->mockClient->expects($this->once())->method('performHttpRequest')->with("GET", 'calls/foo/legs/bar/recordings/baz', null, null);
+        $this->client->voiceRecordings->read('foo', 'bar', 'baz');
+    }
+
+
+    /**
+     * @expectedException MessageBird\Exceptions\ServerException
+     */
+    public function testDownloadVoiceRecording()
+    {
+        $this->mockClient->expects($this->once())->method('performHttpRequest')->with("GET", 'calls/foo/legs/bar/recordings/baz.wav', null, null);
+        $this->client->voiceRecordings->download('foo', 'bar', 'baz');
+    }
+
+    public function testCreateVoiceTranscription()
+    {
+        $this->mockClient->expects($this->atLeastOnce())->method('performHttpRequest')->willReturn(array(201, '', '{
+  "data": [
+     {
+       "id": "87c377ce-1629-48b6-ad01-4b4fd069c53c",
+       "recordingID": "baz",
+       "error": null,
+       "createdAt": "2017-06-20T10:03:14Z",
+       "updatedAt": "2017-06-20T10:03:14Z",
+       "_links": {
+         "self": "/calls/foo/legs/bar/recordings/baz/transcriptions/87c377ce-1629-48b6-ad01-4b4fd069c53c",
+         "file": "/calls/foo/legs/bar/recordings/baz/transcriptions/87c377ce-1629-48b6-ad01-4b4fd069c53c.txt"
+       }
+     }
+  ]
+}'));
+        $this->mockClient->expects($this->once())->method('performHttpRequest')->with("POST", 'calls/foo/legs/bar/recordings/baz/transcriptions', null, null);
+        $this->client->voiceTranscriptions->create('foo', 'bar', 'baz');
+    }
+
+    /**
+     * @expectedException MessageBird\Exceptions\ServerException
+     */
+    public function testListVoiceTranscriptions()
+    {
+        $this->mockClient->expects($this->once())->method('performHttpRequest')->with("GET", 'calls/foo/legs/bar/recordings/baz/transcriptions', array(
+            'offset' => 100,
+            'limit' => 30,
+        ), null);
+        $this->client->voiceTranscriptions->getList('foo', 'bar', 'baz', array('offset' => 100, 'limit' => 30));
+    }
+
+    /**
+     * @expectedException MessageBird\Exceptions\ServerException
+     */
+    public function testReadVoiceTranscription()
+    {
+        $this->mockClient->expects($this->once())->method('performHttpRequest')->with("GET", 'calls/foo/legs/bar/recordings/baz/transcriptions/bups', null, null);
+        $this->client->voiceTranscriptions->read('foo', 'bar', 'baz', 'bups');
+    }
+
+    /**
+     * @expectedException MessageBird\Exceptions\ServerException
+     */
+    public function testDownloadVoiceTranscription()
+    {
+        $this->mockClient->expects($this->once())->method('performHttpRequest')->with("GET", 'calls/foo/legs/bar/recordings/baz/transcriptions/bups.txt', null, null);
+        $this->client->voiceTranscriptions->download('foo', 'bar', 'baz', 'bups');
+    }
+
+    /**
+     * @expectedException MessageBird\Exceptions\ServerException
+     */
+    public function testListVoiceWebhooks()
+    {
+        $this->mockClient->expects($this->once())->method('performHttpRequest')->with("GET", 'webhooks', array(
+            'offset' => 100,
+            'limit' => 30,
+        ), null);
+        $this->client->voiceWebhooks->getList(array('offset' => 100, 'limit' => 30));
+    }
+
+    /**
+     * @expectedException MessageBird\Exceptions\ServerException
+     */
+    public function testReadVoiceWebhook()
+    {
+        $this->mockClient->expects($this->once())->method('performHttpRequest')->with("GET", 'webhooks/foobar', null, null);
+        $this->client->voiceWebhooks->read('foobar');
+    }
+
+    public function testCreateVoiceWebhook()
+    {
+        $webhook = new \MessageBird\Objects\Voice\Webhook();
+        $webhook->url = 'https://example.com/';
+        $webhook->token = 'foobar';
+
+        $this->mockClient->expects($this->atLeastOnce())->method('performHttpRequest')->willReturn(array(201, '', '{
+  "data": [
+    {
+      "id": "534e1848-235f-482d-983d-e3e11a04f58a",
+      "url": "https://example.com/",
+      "token": "foobar",
+      "createdAt": "2017-03-15T13:28:32Z",
+      "updatedAt": "2017-03-15T13:28:32Z",
+      "_links": {
+        "self": "/webhooks/534e1848-235f-482d-983d-e3e11a04f58a"
+      }
+    }
+  ],
+  "_links": {
+    "self": "/webhooks?page=1"
+  },
+  "pagination": {
+    "totalCount": 1,
+    "pageCount": 1,
+    "currentPage": 1,
+    "perPage": 10
+  }
+}'));
+        $this->mockClient->expects($this->once())->method('performHttpRequest')->with("POST", 'webhooks', null, '{"url":"https:\/\/example.com\/","token":"foobar"}');
+        $this->client->voiceWebhooks->create($webhook);
+    }
+
+    public function testUpdateVoiceWebhook()
+    {
+        $webhook = new \MessageBird\Objects\Voice\Webhook();
+        $webhook->url = 'https://example.com/foo';
+        $webhook->token = 'foobar';
+
+        $this->mockClient->expects($this->atLeastOnce())->method('performHttpRequest')->willReturn(array(200, '', '{
+  "data": [
+    {
+      "id": "foobar123",
+      "url": "https://example.com/baz",
+      "token": "foobar",
+      "createdAt": "2017-03-15T13:27:02Z",
+      "updatedAt": "2017-03-15T13:28:01Z"
+    }
+  ],
+  "_links": {
+    "self": "/webhooks/534e1848-235f-482d-983d-e3e11a04f58a"
+  }
+}'));
+        $this->mockClient->expects($this->once())->method('performHttpRequest')->with("PUT", 'webhooks/foobar123', null, '{"url":"https:\/\/example.com\/foo","token":"foobar"}');
+        $this->client->voiceWebhooks->update($webhook, 'foobar123');
+    }
+
+    public function testDeleteVoiceWebhook()
+    {
+        $this->mockClient->expects($this->atLeastOnce())->method('performHttpRequest')->willReturn(array(204, '', null));
+        $this->mockClient->expects($this->once())->method('performHttpRequest')->with("DELETE", 'webhooks/foobar123', null, '');
+        $this->client->voiceWebhooks->delete('foobar123');
+    }
+
+
+    /**
+     * @expectedException MessageBird\Exceptions\ServerException
+     */
+    public function testListVoiceCallFlows()
+    {
+        $this->mockClient->expects($this->once())->method('performHttpRequest')->with("GET", 'call-flows', array(
+            'offset' => 100,
+            'limit' => 30,
+        ), null);
+        $this->client->voiceCallFlows->getList(array('offset' => 100, 'limit' => 30));
+    }
+
+    /**
+     * @expectedException MessageBird\Exceptions\ServerException
+     */
+    public function testReadVoiceCallFlow()
+    {
+        $this->mockClient->expects($this->once())->method('performHttpRequest')->with("GET", 'call-flows/foobar', null, null);
+        $this->client->voiceCallFlows->read('foobar');
+    }
+
+    public function testCreateVoiceCallFlow()
+    {
+        $callFlow = new \MessageBird\Objects\Voice\CallFlow();
+        $callFlow->title = 'Foobar';
+        $callFlow->steps = array(
+           array(
+               'action' => 'transfer',
+               'options' => array(
+                   'destination' => '31612345678',
+               ),
+           ) ,
+        );
+
+        $this->mockClient->expects($this->atLeastOnce())->method('performHttpRequest')->willReturn(array(201, '', '{
+  "data": [
+    {
+      "id": "de3ed163-d5fc-45f4-b8c4-7eea7458c635",
+      "title": "Forward call to 31612345678",
+      "steps": [
+        {
+          "id": "3538a6b8-5a2e-4537-8745-f72def6bd393",
+          "action": "transfer",
+          "options": {
+            "destination": "31612345678"
+          }
+        }
+      ],
+      "createdAt": "2017-03-06T13:34:14Z",
+      "updatedAt": "2017-03-06T13:34:14Z",
+      "_links": {
+        "self": "/call-flows/de3ed163-d5fc-45f4-b8c4-7eea7458c635"
+      }
+    }
+  ],
+  "_links": {
+    "self": "/call-flows?page=1"
+  },
+  "pagination": {
+    "totalCount": 1,
+    "pageCount": 1,
+    "currentPage": 1,
+    "perPage": 10
+  }
+}'));
+        $this->mockClient->expects($this->once())->method('performHttpRequest')->with("POST", 'call-flows', null, '{"title":"Foobar","steps":[{"action":"transfer","options":{"destination":"31612345678"}}]}');
+        $this->client->voiceCallFlows->create($callFlow);
+    }
+
+    public function testUpdateVoiceCallFlow()
+    {
+        $webhook = new \MessageBird\Objects\Voice\Webhook();
+        $webhook->title = 'Updated call flow';
+
+        $this->mockClient->expects($this->atLeastOnce())->method('performHttpRequest')->willReturn(array(200, '', '{
+  "data": [
+    {
+      "id": "de3ed163-d5fc-45f4-b8c4-7eea7458c635",
+      "title": "Updated call flow",
+      "steps": [
+        {
+          "id": "3538a6b8-5a2e-4537-8745-f72def6bd393",
+          "action": "transfer",
+          "options": {
+            "destination": "31611223344"
+          }
+        }
+      ],
+      "createdAt": "2017-03-06T13:34:14Z",
+      "updatedAt": "2017-03-06T15:02:38Z"
+    }
+  ],
+  "_links": {
+    "self": "/call-flows/de3ed163-d5fc-45f4-b8c4-7eea7458c635"
+  }
+}'));
+        $this->mockClient->expects($this->once())->method('performHttpRequest')->with("PUT", 'call-flows/foobar123', null, '{"title":"Updated call flow"}');
+        $this->client->voiceCallFlows->update($webhook, 'foobar123');
+    }
+
+    public function testDeleteVoiceCallFlow()
+    {
+        $this->mockClient->expects($this->atLeastOnce())->method('performHttpRequest')->willReturn(array(204, '', null));
+        $this->mockClient->expects($this->once())->method('performHttpRequest')->with("DELETE", 'call-flows/foobar123', null, '');
+        $this->client->voiceCallFlows->delete('foobar123');
+    }
+}