diff --git a/src/NameAddrHeader.js b/src/NameAddrHeader.js
index b2caf83a8..58c13c576 100644
--- a/src/NameAddrHeader.js
+++ b/src/NameAddrHeader.js
@@ -86,4 +86,21 @@ JsSIP.NameAddrHeader.prototype = {
 
     return body;
   }
+};
+
+
+/**
+  * Parse the given string and returns a JsSIP.NameAddrHeader instance or undefined if
+  * it is an invalid NameAddrHeader.
+  * @public
+  * @param {String} name_addr_header
+  */
+JsSIP.NameAddrHeader.parse = function(name_addr_header) {
+  name_addr_header = JsSIP.Grammar.parse(name_addr_header,'Name_Addr_Header');
+
+  if (name_addr_header !== -1) {
+    return name_addr_header;
+  } else {
+    return undefined;
+  }
 };
\ No newline at end of file
diff --git a/src/URI.js b/src/URI.js
index 578880e30..2432debff 100644
--- a/src/URI.js
+++ b/src/URI.js
@@ -52,6 +52,7 @@ JsSIP.URI = function(scheme, user, host, port, parameters, headers) {
         host = value.toLowerCase();
       }
     },
+
     port: {
       get: function(){ return port; },
       set: function(value){
@@ -163,6 +164,7 @@ JsSIP.URI.prototype = {
 
     return uri;
   },
+
   toAor: function(show_port){
       var aor;