call: pick a sample of 2 of the iceservers before creating connection

ts/session/utils/calling/CallManager.ts

@@ -120,10 +120,11 @@ let ignoreOffer = false;
 let isSettingRemoteAnswerPending = false;
 let lastOutgoingOfferTimestamp = -Infinity;
 
-const configuration: RTCConfiguration = {
+/**
-  bundlePolicy: 'max-bundle',
+ * This array holds all of the ice servers Session can contact.
-  rtcpMuxPolicy: 'require',
+ * They are all contacted at the same time, so before triggering the request, we get only a subset of those, randomly
-  iceServers: [
+ */
+const iceServersFullArray = [
   {
     urls: 'turn:freyr.getsession.org',
     username: 'session202111',
@@ -159,7 +160,11 @@ const configuration: RTCConfiguration = {
     username: 'session202111',
     credential: '053c268164bc7bd7',
   },
-  ],
+];
+
+const configuration: RTCConfiguration = {
+  bundlePolicy: 'max-bundle',
+  rtcpMuxPolicy: 'require',
   // iceTransportPolicy: 'relay', // for now, this cause the connection to break after 30-40 sec if we enable this
 };
 
@@ -701,7 +706,8 @@ function createOrGetPeerConnection(withPubkey: string) {
     return peerConnection;
   }
   remoteStream = new MediaStream();
-  peerConnection = new RTCPeerConnection(configuration);
+  const sampleOfICeServers = _.sampleSize(iceServersFullArray, 2);
+  peerConnection = new RTCPeerConnection({ ...configuration, iceServers: sampleOfICeServers });
   dataChannel = peerConnection.createDataChannel('session-datachannel', {
     ordered: true,
     negotiated: true,