diff --git a/src/modules/cdp/README b/src/modules/cdp/README
index 964afea05d8..148293b4d9f 100644
--- a/src/modules/cdp/README
+++ b/src/modules/cdp/README
@@ -12,9 +12,17 @@ Edited by
 
 Richard Good
 
+Edited by
+
+Carsten Bock
+
+   ng-voice GmbH
+
    Copyright © 2006 FhG Fokus
 
    Copyright © 2012 Smile Communications
+
+   Copyright © 2017 ng-voice GmbH
      __________________________________________________________________
 
    Table of Contents
@@ -35,15 +43,20 @@ Richard Good
               4.3. workerq_length_threshold_percentage (int)
               4.4. debug_heavy (int)
 
-        5. RPC Commands
+        5. Functions
+
+              5.1. cdp_check_peer(fqdn)
+              5.2. cdp_has_app([vendorid, ]application)
+
+        6. RPC Commands
 
-              5.1. cdp.disable_peer
-              5.2. cdp.enable_peer
+              6.1. cdp.disable_peer
+              6.2. cdp.enable_peer
 
-        6. Configuration Examples
+        7. Configuration Examples
 
-              6.1. DiameterPeer.xml example
-              6.2.
+              7.1. DiameterPeer.xml example
+              7.2.
 
    2. Developer Guide
 
@@ -125,7 +138,10 @@ Richard Good
    1.2. Set latency_threshold parameter
    1.3. Set workerq_length_threshold_percentage parameter
    1.4. Set debug_heavy parameter
-   1.5. DiameterPeer.xml example
+   1.5. cdp_check_peer usage
+   1.6. cdp_check_peer usage
+   1.7. cdp_check_peer usage
+   1.8. DiameterPeer.xml example
 
 Chapter 1. Admin Guide
 
@@ -145,15 +161,20 @@ Chapter 1. Admin Guide
         4.3. workerq_length_threshold_percentage (int)
         4.4. debug_heavy (int)
 
-   5. RPC Commands
+   5. Functions
 
-        5.1. cdp.disable_peer
-        5.2. cdp.enable_peer
+        5.1. cdp_check_peer(fqdn)
+        5.2. cdp_has_app([vendorid, ]application)
 
-   6. Configuration Examples
+   6. RPC Commands
 
-        6.1. DiameterPeer.xml example
-        6.2.
+        6.1. cdp.disable_peer
+        6.2. cdp.enable_peer
+
+   7. Configuration Examples
+
+        7.1. DiameterPeer.xml example
+        7.2.
 
 1. Overview
 
@@ -261,32 +282,78 @@ modparam("cdp", "workerq_length_threshold_percentage", 25)
 modparam("cdp", "debug_heavy", 1)
 ...
 
-5. RPC Commands
+5. Functions
+
+   5.1. cdp_check_peer(fqdn)
+   5.2. cdp_has_app([vendorid, ]application)
+
+5.1.  cdp_check_peer(fqdn)
+
+   The method checks, if a specific peer is connected and ready.
+
+   Meaning of the parameter is as follows:
+     * fqdn - the Fully qualified domai name of the peer, that should be
+       checked. The parameter may contain pseudovariables.
+
+   Example 1.5. cdp_check_peer usage
+...
+if(!cdp_check_peer("hss.mnc001.mcc001.3gppnetwork.org")) {
+        send_reply("503", "HSS not ready");
+        exit;
+}
+...
+
+5.2.  cdp_has_app([vendorid, ]application)
+
+   The method checks, if any peer with this specific application has
+   connected.
+
+   Meaning of the parameters are as follows:
+     * vendorid - The Vendor ID of the App
+       application - The Application ID
+
+   Example 1.6. cdp_check_peer usage
+...
+if(!cdp_has_app("10415", "4")) {
+        send_reply("503", "Charging Server not ready");
+        exit;
+}
+...
+
+   Example 1.7. cdp_check_peer usage
+...
+if(!cdp_has_app("16777216")) {
+        send_reply("503", "Cx/Dx Interface not ready");
+        exit;
+}
+...
+
+6. RPC Commands
 
-   5.1. cdp.disable_peer
-   5.2. cdp.enable_peer
+   6.1. cdp.disable_peer
+   6.2. cdp.enable_peer
 
    exported RPC commands.
 
-5.1. cdp.disable_peer
+6.1. cdp.disable_peer
 
    instantly disable a particular diameter peer.
 
-5.2. cdp.enable_peer
+6.2. cdp.enable_peer
 
    enabe/re-enable a diameter peer
 
-6. Configuration Examples
+7. Configuration Examples
 
-   6.1. DiameterPeer.xml example
-   6.2.
+   7.1. DiameterPeer.xml example
+   7.2.
 
-6.1. DiameterPeer.xml example
+7.1. DiameterPeer.xml example
 
    This is an example CDP configuration file. The location of this file is
    configured as a CDP parameter (config_file) - See section 4.1 Above
 
-   Example 1.5. DiameterPeer.xml example
+   Example 1.8. DiameterPeer.xml example
 <?xml version="1.0" encoding="UTF-8"?>
 <!--