A-3
Cisco Unified IP Phone 7960G and 7940G Administration Guide for Release 8.0 (SIP)
OL-7890-01
Appendix A Compliance with RFC 3261
SIP Responses
1
xx
Response—Information Responses
2
xx
Response—Successful Responses
3
xx
Response—Redirection Responses
1
xx
Response
Supported?
Comments
100 Trying
Yes
The phone generates this response for an incoming
INVITE. Upon receiving this response, the phone
waits for a 180 Ringing, 183 Session Progress, or 200
OK response.
180 Ringing
Yes
—
181 Call Is Being Forwarded See comments
The phone does not generate these responses; however,
the phone does receive them. The phone processes
these responses in the same way that it processes the
100 Trying response.
182 Queued
183 Session Progress
The phone does not generate this message. Upon
receiving this response, the phone provides early
media cut-through and then waits for a 200 OK
response.
2
xx
Response
Supported?
Comments
200 OK
Yes
—
202 Accepted
Yes
—
3
xx
Response
Supported?
Comments
300 Multiple Choices
Yes
—
301 Moved Permanently
Yes
302 Moved Temporarily
Yes
The phone generates this response when local call
forwarding is enabled. Upon receiving this response,
the phone sends an INVITE that contains the contact
information received in the 302 Moved Temporarily
response.
305 Use Proxy
Yes
The phone does not generate these responses. The
phone contacts the new address in the Contact header
field.
380 Alternate Service
Yes
