Yealink T27P

Administrator’s Guide for SIP-T2_Series_T4_Series IP Phones
564
Session Initiation Protocol (SIP)
To find the applicable Request for Comments (RFC) document, go to
http://www.ietf.org/rfc.html and enter the RFC number.
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
In the following table, a “Yes” in the Supported column means the header is sent and
properly parsed.