SIP：假如UE在TCP上发出的Register请求被对方回了RST，UE会做什么？

2023-12-19 23:23:34

SIP：假如UE在TCP上发出的Register请求被对方回了TCP RST，UE会做什么？
3GPP-24229
III. The UE may use pre-configured P-CSCF address(es) (IP address or domain name). For example:
a. The UE selects a P-CSCF from the list stored in ISIM or IMC;
b. The UE selects a P-CSCF from the list in IMS management object.

RFC5626
If a re-registration is rejected with a recoverable error response, for example by a 503 (Service Unavailable) containing a Retry-After header, the UAC SHOULD NOT tear down the corresponding flow if the flow uses a connection-oriented transport such as TCP. As long as “pongs” are received in response to “pings”, the flow SHOULD be kept active until a non-recoverable error response is received. This prevents unnecessary closing and opening of connections.

RFC3263
For SIP requests, failure occurs if the transaction layer reports a 503 error response or a transport failure of some sort (generally, due to fatal ICMP errors in U

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