Make 'password' configuration parameter optional

src/RequestSender.js

@@ -72,7 +72,7 @@ JsSIP.RequestSender.prototype = {
     * Authentication
     * Authenticate once. _challenged_ flag used to avoid infinite authentications.
     */
-    if ((status_code === '401' || status_code === '407') && !this.challenged) {
+    if ((status_code === '401' || status_code === '407') && !this.challenged && this.ua.configuration.password !== null) {
       authorization = JsSIP.DigestAuthentication(this.ua, this.request, response);
 
       if (status_code === '401') {

src/UA.js

@@ -552,6 +552,9 @@ JsSIP.UA.prototype.loadConfig = function(configuration) {
       */
       via_host: Math.random().toString(36).substr(2, 12) + '.invalid',
 
+      // Password
+      password: null,
+
       // Registration parameters
       register_expires: 600,
       register_min_expires: 120,
@@ -708,14 +711,14 @@ JsSIP.UA.configuration_skeleton = (function() {
 
       // Mandatory user configurable parameters
       "outbound_proxy_set",
-      "password",
       "uri",
 
       // Optional user configurable parameters
       "authorization_user",
       "display_name",
       "hack_via_tcp", // false.
       "hack_ip_in_contact", //false
+      "password",
       "stun_server",
       "no_answer_timeout", // 30 seconds.
       "register_expires", // 600 seconds.
@@ -797,13 +800,6 @@ JsSIP.UA.configuration_check = {
       } else {
         return true;
       }
-    },
-    password: function(password) {
-      if(JsSIP.grammar.parse(password, 'password') === -1) {
-        return false;
-      } else {
-        return true;
-      }
     }
   },
   optional: {
@@ -843,6 +839,13 @@ JsSIP.UA.configuration_check = {
         return true;
       }
     },
+    password: function(password) {
+      if(JsSIP.grammar.parse(password, 'password') === -1) {
+        return false;
+      } else {
+        return true;
+      }
+    },
     stun_server: function(stun_server) {
       var parsed;