处理通话事件

Future<void> registerCallListener() {
  return OpenIM.iMManager.signalingManager.setSignalingListener(
    OnSignalingListener(
      onReceiveNewInvitation: handleIncomingCall,
      onInviteeAccepted: handleInviteeAccepted,
      onInviteeRejected: handleInviteeRejected,
      onInvitationCancelled: handleInvitationCancelled,
      onInvitationTimeout: handleInvitationTimeout,
      onInviteeAcceptedByOtherDevice: handleAcceptedElsewhere,
      onInviteeRejectedByOtherDevice: handleRejectedElsewhere,
      onHangup: handleHangup,
      onRoomParticipantConnected: handleParticipantConnected,
      onRoomParticipantDisconnected: handleParticipantDisconnected,
      onStreamChange: handleStreamChange,
    ),
  );
}