Yealink SIP-T23, Provisioning Manual

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Appendix
275
Parameter
Permitted
Values
Descriptions Web Setting Path
When the RFC 4916 is enabled on the IP
phone, the caller sends the SIP request
message which contains the from-change tag
in the Supported header. The caller then
receives an UPDATE message from the callee,
and displays the identity in the From header.
The default value is 0.
account.X.session_timer.enable
(X ranges from 1 to 3)
0 or 1
It enables or disables the session timer for
account X.
0-Disabled
1-Enabled
If it is set to 1 (Enabled), the IP phone will send
periodic re-INVITE requests to refresh the
session during a call.
The default value is 0.
Account->Advanced->Session Timer
account.X.session_timer.expires
(X ranges from 1 to 3)
Integer from
30 to 7200
It configures the interval (in seconds) for
refreshing the SIP session during a call for
account X.
If it is set to 1800 (1800s), the IP phone will
refresh the session during a call before 1800
seconds.
Account->Advanced->Session
Expires (30~7200s)