A-7
Cisco SIP Proxy Server Administrator Guide
Appendix A SIP Compliance
RFC 2543 and RFC 3261
SIP Transport Layer Protocols
Table A-4 SIP Header Fields
Header Field Supported? Header Field Supported?
Accept Yes Organization Yes
Accept-Encoding Yes MIME-Version Yes
Accept-Language Yes Priority Yes
Alert-Info Yes Proxy-Authenticate Yes
Allow Yes Proxy Authorization Yes
Also Yes Proxy-Require Yes
Authorization Yes Record-Route Yes
Call-ID Yes Require Yes
Call-Info Yes Response-Key Yes
Contact Yes Retry-After Yes
Content-Disposition Yes Route Yes
Content-Encoding Yes Server Yes
Content-Length Yes Subject Yes
Content-Type Yes Supported Yes
Cseq Yes Timestamp Yes
Date Yes To Yes
Encryption
1
1. When a SIP message is received that contains this header field, the message is processed with the field ignored.
No Unsupported Yes
Error-Info Yes User-Agent Yes
Expires Yes Via Yes
From Yes Warning Yes
In-Reply-To Yes WWW-Authenticate Yes
Max-Forwards Yes
Table A-5 SIP Transport Layer Protocols
Transport Layer Protocol Supported?
Unicast UDP Yes
Multicast UDP No
TCP Yes
TLS Yes
