| cancel | Android/iOS | Caller canceled the call request |
| reject | Android/iOS | Caller rejected the incoming call |
| hangup | Android/iOS | Caller hung up |
| busy_line | Android/iOS | Caller is busy |
| no_response | Android/iOS | Caller didn't answer |
| engine_unsupported | Android/iOS | Caller's device doesn't support current engine |
| network_error | Android/iOS | Caller's network error |
| resource_error | iOS | Caller failed to obtain media resources |
| publish_error | iOS | Caller failed to publish resources |
| subscribe_error | iOS | Caller failed to subscribe to resources |
| remote_cancel | Android/iOS | Callee canceled the call request |
| remote_reject | Android/iOS | Callee rejected the incoming call |
| remote_hangup | Android/iOS | Callee hung up during call |
| remote_busy_line | Android/iOS | Callee is busy |
| remote_no_response | Android/iOS | Callee didn't answer |
| remote_engine_unsupported | Android/iOS | Callee's device doesn't support current engine |
| remote_network_error | Android/iOS | Callee's network error |
| remote_resource_error | iOS | Callee failed to obtain media resources |
| remote_publish_error | iOS | Callee failed to publish resources |
| remote_subscribe_error | iOS | Callee failed to subscribe to resources |
| kicked_by_other_call | iOS | Caller's other device joined a new call |
| in_other_call | iOS | Caller's other device is already in a call |
| kicked_by_server | Android/iOS | Caller is banned from making calls |
| remote_kicked_by_other_call | iOS | Callee's other device joined a new call |
| remote_in_other_call | iOS | Callee's other device is already in a call |
| remote_kicked_by_server | iOS | Callee is banned from making calls |
| accept_by_other_client | iOS | Caller's other device answered the call |
| hangup_by_other_client | iOS | Caller's other device hung up |
| add_to_black_list | Android/iOS | Caller was added to callee's blocklist |
| media_server_closed | Android/iOS | RTC service closed |
| degrade | iOS | Caller was downgraded to observer |
| init_video_error | Android | Caller's camera initialization failed (possibly due to missing permissions) |
| other_device_had_accepted | Android | Another device already answered |
| service_disconnected | Android | IM IPC service disconnected |