如果远端不支持邀请中提到的任何编解码器，会发生什么？ 以及如何解决？

Question

What happens when far end doesn't support any of the mentioned codecs in the invite? And how to resolve it?

Answer 1

The answer to this question can be found in RFC3261 which specifies the SIP protocol. I recommend reading it before you start with SIP.

The user agent server (UAS, the 'far'end') will return a final failure response. Most likely 606 Not Acceptable since it doesn't support any of the codecs offered.

The response may contain an SDP body containing the media capabilities the UAS does support. If this body contains media codecs the user agent client (UAC) also supports the UAC can decide to send a new INVITE request containing this set of media codecs.