Yealink SIP-T21 E2

Administrator’s Guide for SIP-T2 Series/T19(P) E2/T4 Series/T5 Series/CP860/CP920 IP Phones
1056
 draft-levy -sip-diversion-08.txt—Diversion Indication in SIP
 draft-ietf-sipping-cc-conferencing-03.txt—SIP Call Control - Conferencing for User Agents
 draft-ietf-sipping-cc-conferencing-05.txt—Connection Reuse in the Session Initiation
Protocol (SIP)
 draft-ietf-sipping-rtcp-summary-02.txt—Session Initiation Protocol Package for Voice
Quality Reporting Event
 draft-ietf-sip-connect-reuse-06.txt—Connection Reuse in the Session Initiation Protocol
(SIP)
 draft-ietf-bliss-shared-appearances-15.txt—Shared Appearances of a Session Initiation
Protocol (SIP) Address of Record (AOR)
To find the applicable Request for Comments (RFC) document, go to
http://www.ietf.org/rfc.html and enter the RFC number.
SIP Request
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