internal static extern void UnsetIrisRtcChannelEventHandler(IrisRtcChannelPtr channel_ptr, IrisEventHandlerHandle handle);
internal static extern void UnRegisterIrisRtcChannelEventHandler(IrisRtcChannelPtr channel_ptr, IrisEventHandlerHandle handle, string channel_id);
internal static extern void UnsetIrisRtcEngineEventHandler(IrisRtcEnginePtr engine_ptr, IrisEventHandlerHandle handle);