Appendix A SIP Compliance with RFC-2543 Information
SIP Responses
A-6
Cisco SIP IP Phone 7960 Administrator Guide
78-10497-02
401 Unauthorized Yes This response is only received in this
release.
If a 401 Unauthorized response is
received during registration, the phone
accepts the response and sends a new
request that contains the user’s
authentication information in the format
of the HTTP digest as modified by
RFC 2543.
402 Payment
Required
Yes The phone does not generate the 402
Payment Required response.
403 Forbidden Yes This response is only received in this
release.
If the phone receives a 403 Forbidden
response, it notifies the user of the
response. This response indicates that
the SIP server has the request but will
not provide service.
404 Not Found Yes The Cisco SIP IP phone generates this
response if it is unable to locate the
callee. Upon receiving this response, the
phone notifies the user.
405 Method Not
Allowed
See comments This response is only received in this
release.
If the phone receives a 405 Method Not
Allowed response, it notifies the user of
the response.
406 Not
Acceptable
See comments The SIP phone does not generate a 406
Not Acceptable response. For an
incoming response, the gateway initiates
a graceful call disconnect (during which
the caller hears a busy or fast busy tone)
before clearing the call request.
4xx Response Supported? Comments
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