A-7
Cisco SIP IP Phone Administrator Guide
Appendix A SIP Compliance with RFC 3261 Information
SIP Header Fields
6
xx
Response—Global Responses
SIP Header Fields
6
xx
Response
Comments
600 Busy Everywhere
The Cisco SIP IP phone does not generate these 6xx responses. For
an incoming response, the SIP IP phone initiates a graceful call
disconnect.
603 Decline
604 Does Not Exist Anywhere
606 Not Acceptable
Header Field
Supported?
Accept
Yes
Accept-Encoding
Yes
Accept-Language
Yes
Allow
Yes
Also
Yes
Authorization
Yes
Call-ID
Yes
Contact
Yes
Content-Encoding
Yes
Content-Length
Yes
Content-Type
Yes
Cseq
Yes
Date
Yes
Encryption
No
Expires
Yes
From
Yes
Hide
No
Max-Forwards
Yes
Organization
No
Priority
No
Proxy-Authenticate
Yes