Multi-party call: Unable to re-enter the room after switching networks #4523
Description
Using WebRTC for multi-party calling, after joining the room, perform the following network switching operation:
（1）Connect only to the company's intranet, join the room for an audio conference
（2）Connect to the external Wi-Fi network and disconnect from the intranet.
（3）You will find that you cannot hear the voices of other people in the room, and the connection has been disconnected.
At this point, after closing SrsRtcPublisherAsync, SrsRtcPlayerAsync, and SrsRtcSignalingAsync, attempting to rejoin the room fails and the signaling log reports the following error:
2025-09-29T03:19:13.972615709Z [warn] 2025/09/29 11:19:13.972519 [1][8643] Handle {"tid":"6380588","msg":{"action":"join","room":"live","display":"zhy_ceshi"}} err join: Participant zhy_ceshi exists in room live
Attempting to send the following message:
sig.send({action: 'leave', room: "live", display: "zhy_ceshi"})
Still unable to join the room, the signaling log is as follows:
2025-09-29T03:19:52.279949393Z [warn] 2025/09/29 11:19:52.279695 [1][8638] Handle {"tid":"2163463","msg":{"action":"leave","room":"zhy_ceshi","display":"live"}} err Invalid message {"tid":"2163463","msg":{"action":"leave","room":"zhy_ceshi","display":"live"}}
After waiting for a while, the system should have cleaned up the connection, and then it becomes possible to enter the room again.
How should this situation be handled when switching networks?