onRemoteSDPEventOffer method
Implementation
@override
void onRemoteSDPEventOffer(int? opponentId, String? sdp) {
logTime("onRemoteSDPEventOffer", _TAG);
// set CallType.VIDEO_CALL for getting video in any call mode (audio, video)
opponentId ??= subscriberId;
_makeAndAddNewChannelForOpponent(opponentId);
createAnswer(opponentId, sdp);
}