Administrator’s Guide for SIP-T2xP IP Phones
184
Session timer allows a periodic refresh of SIP sessions through a re-INVITE request, to
determine whether a SIP session is still active. Session timer is specified in RFC 4028. IP
phones support two refresher modes: UAC and UAS. The UAC mode means refreshing
the session from the client, while the UAS mode means refreshing the session from the
server. The session expiration and session refresher are negotiated via the
Session-Expires header in the INVITE message. The negotiated refresher will send a
re-INVITE/UPDATE request at or before the negotiated session expiration.
Procedure
Session timer can be configured using the configuration files or locally.
Configuration File
<MAC>.cfg
Configure session timer.
Parameters:
account.X.session_timer.enable
account.X.session_timer.expires
account.X.session_timer.refresher
Local
Web User Interface
Configure session timer.
Navigate to:
http://<phoneIPAddress>/servlet
?p=account-adv&q=load&acc=
0
Details of Configuration Parameters:
Parameters
Permitted Values
Default
account.X.session_timer.enable
0 or 1
0
Description:
Enables or disables the session timer for account X.
0-Disabled
1-Enabled
If it is set to 1 (Enabled), IP phone will send periodic re-INVITE requests to refresh the
session during a call.
X ranges from 1 to 6 (for SIP-T28P).
X ranges from 1 to 3 (for SIP-T26P/T22P).
X ranges from 1 to 2 (for SIP-T20P).
Web User Interface:
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