A-8
Cisco SIP IP Phone Administrator Guide
Appendix A SIP Compliance with RFC 3261 Information
SIP Session Description Protocol (SDP) Usage
SIP Session Description Protocol (SDP) Usage
Proxy-Authorization
Yes
Proxy-Require
Yes
Record-Route
Yes
Referred-By
Yes
Referred-To
Yes
Remote-Party-ID
Yes
Replaces
Yes
Requested-By
Yes
Require
Yes
Response-Key
No
Retry-After
Yes
Route
Yes
Server
Yes
Subject
No
Timestamp
Yes
To
Yes
Unsupported
Yes
User-Agent
Yes
Via
Yes
Warning
Yes
WWW-Authenticate
Yes
SDP Headers
Supported?
v—Protocol version
Yes
o—Owner or creator and
session identifier
Yes
s—Session name
Yes
t—Time description
Yes
c—Connection information
Yes
Header Field
Supported?