________________________________________ From: [email protected] [[email protected]] On Behalf Of kaiduan xie [[email protected]]
Consider the following case, A sends an offer with codec G.729 only, and B does not support it, what is the best response code? 415/488 is not for this case from rfc3261. 21.4.13 415 Unsupported Media Type The server is refusing to service the request because the message body of the request is in a format not supported by the server for the requested method. The server MUST return a list of acceptable formats using the Accept, Accept-Encoding, or Accept-Language header field, depending on the specific problem with the content. UAC processing of this response is described in Section 8.1 21.4.26 488 Not Acceptable Here The response has the same meaning as 606 (Not Acceptable), but only applies to the specific resource addressed by the Request-URI and the request may succeed elsewhere. A message body containing a description of media capabilities MAY be present in the response, which is formatted according to the Accept header field in the INVITE (or application/sdp if not present), the same as a message body in a 200 (OK) response to an OPTIONS request And rfc3264 is not clear on this neither, An offered stream MAY be rejected in the answer, for any reason. If a stream is rejected, the offerer and answerer MUST NOT generate media (or RTCP packets) for that stream. To reject an offered stream, the port number in the corresponding stream in the answer MUST be set to zero. Any media formats listed are ignored. At least one MUST be present, as specified by SDP. _______________________________________________ You are correct. 415 is only used when the INVITE's body has a type that the UAS cannot understand. Since the INVITE's body is always application/sdp, this is never the case. One alternative is to send a 488 response with a 305 warning code. (Provide sample SDP showing all codecs the phone supports in the response.) Another alternative is to send 200 OK but in the SDP reject all the media streams. (But to provide payload numbers for the codecs that the phone does support so that someone trying to diagnose the problem can determine what the phone does support.) Dale _______________________________________________ Sip-implementors mailing list [email protected] https://lists.cs.columbia.edu/cucslists/listinfo/sip-implementors
