0103 Processing 4xx Responses
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Certain 4xx response codes require specific UA processing,
independent of the method.
If a 401 (Unauthorized) or 407 (Proxy Authentication Required)
response is received, the UAC SHOULD follow the authorization
procedures of Section 22.2 and Section 22.3 to retry the request with
credentials.
If a 413 (Request Entity Too Large) response is received (Section
21.4.11), the request contained a body that was longer than the UAS
was willing to accept. If possible, the UAC SHOULD retry the
request, either omitting the body or using one of a smaller length.
If a 415 (Unsupported Media Type) response is received (Section
21.4.13), the request contained media types not supported by the UAS.
The UAC SHOULD retry sending the request, this time only using
content with types listed in the Accept header field in the response,
with encodings listed in the Accept-Encoding header field in the
response, and with languages listed in the Accept-Language in the
response.
If a 416 (Unsupported URI Scheme) response is received (Section
21.4.14), the Request-URI used a URI scheme not supported by the
server. The client SHOULD retry the request, this time, using a SIP
URI.
If a 420 (Bad Extension) response is received (Section 21.4.15), the
request contained a Require or Proxy-Require header field listing an
option-tag for a feature not supported by a proxy or UAS. The UAC
SHOULD retry the request, this time omitting any extensions listed in
the Unsupported header field in the response.
In all of the above cases, the request is retried by creating a new
request with the appropriate modifications. This new request
constitutes a new transaction and SHOULD have the same value of the
Call-ID, To, and From of the previous request, but the CSeq should
contain a new sequence number that is one higher than the previous.
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