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标题: IMS/SIP - 183 Progress消息的作用 [查看完整版帖子] [打印本页]

时间: 2022-7-26 09:55

作者: yyh19820713 标题: IMS/SIP - 183 Progress消息的作用

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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