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Appendix A SIP Compliance with RFC-2543 Information
SIP Responses
A-4
Cisco SIP IP Phone 7960 Administrator Guide
78-10497-02
1xx Response—Information Responses
2xx Response—Successful Responses
1xx Response Supported? Comments
100 Trying Yes The Cisco SIP IP 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 None
181 Call is being
forwarded
See comments
The Cisco SIP IP phone does not
generate these responses, however, the
phone does receive them. The phone
processes these responses the same way
that it processes the 100 Trying
response.
182 Queued
183 Session
Progress
The SIP IP 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.
2xx Response Supported? Comments
200 OK Yes None