User Manual

Appendix
391
Method
Supported
Notes
Refer-To
Yes
Referred-By
Yes
Remote-Party-ID
Yes
Replaces
Yes
Require
Yes
Route
Yes
RSeq
Yes
Session-Expires
Yes
Subscription-State
Yes
Supported
Yes
To
Yes
User-Agent
Yes
Via
Yes
SIP Responses
The following SIP responses are supported:
Note
1xx Response—Information Responses
1xx Response
Supported
Notes
100 Trying
Yes
180 Ringing
Yes
181 Call Is Being Forwarded
Yes
183 Session Progress
Yes
In the following table, a “Yes” in the Supported column means the header is sent and properly
parsed. The phone may not actually generate the response.