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注册:2009-6-114
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发表于 2022-7-26 09:55:54 |只看该作者 |正序浏览
关于SIP 183 Progress消息的作用,看到如下一段描述:
The called party's VoLTE UE will return an SDP answer in a SIP 183 Progress message. The SDP answer should contain only one codec and indicates that preconditions are also desired but not yet met at the terminating end and that a confirmation should be sent when QOS preconditions have been met at the originating side and that the media stream is inactive.
- 只能包含一个codec
- 告诉MO端需要做precondition,并且MT端的precondition还没有完成
- MO端QoS precondition达成后需要发送确认消息给MT端
- 目前media stream还处于inactive状态

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