A-2
Cisco SIP Proxy Server Administrator Guide
Appendix A SIP Compliance
RFC 2543 and RFC 3261
RFC 2543 and RFC 3261
SIP Functions
SIP Methods
Cisco SPS supports five of the six methods used by SIP. It handles unknown methods such as
NEWMETHOD in the same manner as known methods such as OPTIONS and REFER.
SIP Responses
Cisco SPS supports the following SIP responses:
• 1xx Response—Information Responses
• 2xx Response—Successful Responses
• 3xx Response—Redirection Responses
• 4xx Response—Request Failure Responses
Table A-1 SIP Functions
Function Supported?
Proxy server Yes (transaction stateful, parallel forking, and
recursive)
Redirect server Yes
Registrar server Yes
Table A-2 SIP Methods
Method Supported? Cisco SPS Action
ACK Yes Forwards ACK requests.
1
1. The SPS can generate a local ACK for a non-200 OK final response to an INVITE request.
BYE Yes Forwards BYE requests.
CANCEL Yes Forwards CANCEL requests.
2
2. The SPS can generate a local CANCEL for a pending branch when it receives a 200 OK or 6xx response from the branch.
INFO Yes Forwards INFO requests.
INVITE Yes Forwards INVITE requests.
NOTIFY Yes Forwards NOTIFY requests.
OPTIONS Yes Responds to OPTIONS requests.
REFER Yes Forwards REFER requests.
REGISTER Yes Supports both user and device registration.
SUBSCRIBE Yes Forwards SUBSCRIBE requests.
UPDATE Yes Forwards UPDATE requests.
