A-9
Cisco SIP IP Phone 7960 Administrator Guide
78-10497-02
Appendix A      SIP Compliance with RFC-2543 Information
SIP Responses
480 Temporarily 
Unavailable
See comments This response is only received by the 
phone in this release. The user is notified 
if this response is received.
If this response is received, the user is 
notified that the callee is temporarily 
unavailable (perhaps not logged on) and 
any retry information is displayed.
481 Call 
Leg/Transaction 
Does Not Exist
See comments
This response is only received by the 
phone in this release. The user is notified 
if this response is received.
482 Loop Detected
483 Too Many 
Hops
484 Address 
Incomplete
485 Ambiguous See comments This response is only received by the 
phone in this release. 
If a new contact is received, the phone 
might re-initiate the call.
486 Busy Here Yes The Cisco SIP IP phone generates this 
response if the called party is off hook 
and the call cannot be presented as a call 
waiting call. Upon receiving this 
response, the phone notifies the user and 
generates a busy tone.
487 Request 
Canceled
See comments This response is only received by the 
phone in this release. 
This response indicates that the initial 
request is terminated with a BYE or 
CANCEL request.
488 Not 
Acceptable
Yes The Cisco SIP IP phone receives and 
generates this response. 
4xx Response Supported? Comments