User's Manual

Chapter 18: SIP messages supported by the
IP Deskphone
SIP methods
The table below provides a list of SIP messages supported by the IP Deskphone.
Table 52: SIP methods
Method Supported? Comments
INVITE Yes Mid-call re-invites for media changes also supported.
ACK Yes
BYE Yes
CANCEL Yes
OPTIONS Response
only
INFO Yes Optionally used for in-session DTMF signaling, and Avaya
Call Server specific NAT detection
PING Yes Proxy detection, monitoring and Avaya Call Server
specific firewall traversal
REGISTER Yes For user registration
REFER Yes For transfer
NOTIFY Yes
SUBSCRIBE Yes
PUBLISH Yes For VQMon Publish
PRACK Yes No support for PRACK-specific early-media negotiation
scenarios
MESSAGE Yes
UPDATE Yes UPDATE messages received in an early dialog state
require reliable provisional responses. If PRACK is
disabled, or not used by a local or remote party, some
UPDATE operations fail as described in RFC3311. The
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