Add iceGatheringTimeout for UaSettings.

Author: cloudwebrtc

lib/src/config.dart

@@ -59,6 +59,9 @@ class Settings {
   String jssip_id;
 
   String hostport_params;
+
+  /// ICE Gathering Timeout (in millisecond).
+  int ice_gathering_timeout = 500;
 }
 
 // Configuration checks.

lib/src/rtc_session.dart

@@ -1696,7 +1696,7 @@ class RTCSession extends EventManager {
            *  Because trickle ICE is not defined in the sip protocol, the delay of
            * initiating a call to answer the call waiting will be unacceptable.
            */
-          setTimeout(() => ready(), 500);
+          setTimeout(() => ready(), ua.configuration.ice_gathering_timeout);
         }
       }
     };

lib/src/sip_ua_helper.dart

@@ -116,6 +116,8 @@ class SIPUAHelper extends EventManager {
     _settings.register_extra_contact_uri_params =
         uaSettings.registerParams.extraContactUriParams;
     _settings.dtmf_mode = uaSettings.dtmfMode;
+    _settings.session_timers = uaSettings.sessionTimers;
+    _settings.ice_gathering_timeout = uaSettings.iceGatheringTimeout;
 
     try {
       _ua = UA(_settings);
@@ -640,6 +642,12 @@ class UaSettings {
   /// DTMF mode, in band (rfc2833) or out of band (sip info)
   DtmfMode dtmfMode = DtmfMode.INFO;
 
+  /// Session Timers
+  bool sessionTimers = true;
+
+  /// ICE Gathering Timeout, default 500ms
+  int iceGatheringTimeout = 500;
+
   List<Map<String, String>> iceServers = <Map<String, String>>[
     <String, String>{'url': 'stun:stun.l.google.com:19302'},
 // turn server configuration example.