Yealink SIP-T2XP - Page 453

Appendix
437
The following SIP request messages are supported:
Method
Supported
Notes
REGISTER
Yes
INVITE
Yes
Yealink IP phones support
mid-call changes such as
placing a call on hold as
signaled by a new INVITE
that contains an existing
Call-ID.
ACK
Yes
CANCEL
Yes
BYE
Yes
OPTIONS
Yes
SUBSCRIBE
Yes
NOTIFY
Yes
REFER
Yes
PRACK
Yes
INFO
Yes
MESSAGE
Yes
UPDATE
Yes
PUBLISH
Yes
The following SIP request headers are supported:
Note
Method
Supported
Notes
Accept
Yes
Alert-Info
Yes
In the following table, a “Yes” in the Supported column means the header is sent and
properly parsed.