onConnected method
Handles 2xx responses raised by library and route it to matched call instance
Implementation
void onConnected(int callId, String from, String to, bool withVideo) {
 _logs?.print('onConnected callId:$callId from:$from to:$to withVideo:$withVideo');
 _cdrs?.setConnected(callId, from, to, withVideo);
 int index = _callItems.indexWhere((c) => c.myCallId==callId);
 if(index != -1) _callItems[index].onConnected(from, to, withVideo);
 notifyListeners();
  }