A-5
Cisco SIP IP Phone 7960 Administrator Guide
78-10497-02
Appendix A      SIP Compliance with RFC-2543 Information
SIP Responses
3xx Response—Redirection Responses
4xx Response—Request Failure Responses
3xx Response Supported Comments
300 Multiple 
Choices
Yes
None
301 Moved 
Permanently
Yes
302 Moved 
Temporarily
Yes The Cisco SIP IP phone does not 
generate this response at this time. Upon 
receiving this response, the phone sends 
an INVITE containing the contact 
information received in the 302 Moved 
temporarily response.
305 Use Proxy Yes The phone does not generate these 
responses. The gateway contacts the new 
address in the Contact header field.
380 Alternate 
Service
Yes
4xx Response Supported? Comments
400 Bad Request Yes The phone generates a 400 Bad Request 
response for a erroneous request. For an 
incoming response, the phone initiates a 
graceful call disconnect (during which 
the caller hears a busy or fast busy tone) 
before clearing the call request.