A-7
Cisco SIP IP Phone 7960 Administrator Guide
78-10497-02
Appendix A      SIP Compliance with RFC-2543 Information
SIP Responses
407 Proxy 
Authentication 
Required
See comments This response is only received in this 
release.
The 407 Proxy Authentication Required 
response indicates that the phone must 
first authenticate itself with the proxy 
server. If received by the phone, the 
phone may repeat the INVITE request 
with a suitable Proxy-Authorization 
field. This field should contain the 
authentication information of the user 
agent for the next outbound proxy or 
gateway.
408 Request 
Timeout
See comments The SIP phone does not generate a 408 
Request Timeout 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.
409 Conflict  See comments This response is only received the phone 
in this release.
The 409 Conflict response indicates that 
the INVITE request could not be process 
because of a conflict with the current 
state of the resource. If this response is 
received, the user is notified.
410 Gone See comments This response is only received by the 
phone in this release. 
The 410 Gone response indicates that a 
resource is no longer available at the 
server and no forwarding address is 
known.
4xx Response Supported? Comments