Enhance transport error handling

- Add disconnection 'cause' and 'code' properties to UA 'disconnection' event handler
- Emit UA 'disconnected' event every time UA is noticed about a transport disconnection regardles there are other servers to reconnect.

src/Transport.js

@@ -20,6 +20,7 @@ JsSIP.Transport = function(ua, server) {
   this.closed = false;
   this.connected = false;
   this.reconnectTimer = null;
+  this.lastTransportError = {};
 
   this.ua.transport = this;
 
@@ -127,6 +128,8 @@ JsSIP.Transport.prototype = {
     var connected_before = this.connected;
 
     this.connected = false;
+    this.lastTransportError.code = e.code;
+    this.lastTransportError.reason = e.reason;
     console.warn(JsSIP.c.LOG_TRANSPORT +'WebSocket disconnected: code=' + e.code + (e.reason? ', reason=' + e.reason : ''));
 
     if(e.wasClean === false) {
@@ -140,6 +143,12 @@ JsSIP.Transport.prototype = {
         // Reset reconnection_attempts
         this.reconnection_attempts = 0;
         this.reConnect();
+      } else {
+        this.ua.emit('disconnected', this.ua, {
+          transport: this,
+          code: this.lastTransportError.code,
+          reason: this.lastTransportError.reason
+        });
       }
     } else {
       // This is the first connection attempt

src/UA.js

@@ -301,6 +301,12 @@ JsSIP.UA.prototype.onTransportError = function(transport) {
   transport.server.status = JsSIP.c.WS_SERVER_ERROR;
   console.log(JsSIP.c.LOG_UA +'connection status set to: '+ JsSIP.c.WS_SERVER_ERROR);
 
+  this.emit('disconnected', this, {
+    transport: transport,
+    code: transport.lastTransportError.code,
+    reason: transport.lastTransportError.reason
+  });
+
   server = this.getNextWsServer();
 
   if(server) {
@@ -310,9 +316,7 @@ JsSIP.UA.prototype.onTransportError = function(transport) {
     if (!this.error || this.error !== JsSIP.c.UA_NETWORK_ERROR) {
       this.status = JsSIP.c.UA_STATUS_NOT_READY;
       this.error = JsSIP.c.UA_NETWORK_ERROR;
-      this.emit('disconnected');
     }
-
     // Transport Recovery process
     this.recoverTransport();
   }
@@ -339,7 +343,9 @@ JsSIP.UA.prototype.onTransportConnected = function(transport) {
 
   this.status = JsSIP.c.UA_STATUS_READY;
   this.error = null;
-  this.emit('connected', this);
+  this.emit('connected', this, {
+    transport: transport
+  });
 
   if(this.configuration.register) {
     if(this.registrator) {