Yealink SIP-T54S Administrator's Manual page 463

Configuring Basic Features
Parameters Permitted Values Default
X ranges from 1 to 16 (for SIP-T54S/T48G/T48S/T46G/T46S/T29G)
X ranges from 1 to 12 (for SIP-T52S/T42G/T42S)
X ranges from 1 to 6 (for SIP-T41P/T41S/T27P/T27G)
X ranges from 1 to 3 (for SIP-T40P/T40G/T23P/T23G)
X ranges from 1 to 2 (for SIP-T21(P) E2)
X is equal to 1 (for SIP-T19(P) E2/CP860/CP920)
Web User Interface:
Account->Advanced->Session Timer
Phone User Interface:
None
Integer from 30
account.X.session_timer.expires 1800
to 7200
Description:
Configures the interval (in seconds) for refreshing the SIP session during a call for account
X. For example, an UPDATE will be sent after 50% of its value has elapsed.
If it is set to 1800 (1800s), the IP phone will refresh the session during a call before 900
seconds.
X ranges from 1 to 16 (for SIP-T54S/T48G/T48S/T46G/T46S/T29G)
X ranges from 1 to 12 (for SIP-T52S/T42G/T42S)
X ranges from 1 to 6 (for SIP-T41P/T41S/T27P/T27G)
X ranges from 1 to 3 (for SIP-T40P/T40G/T23P/T23G)
X ranges from 1 to 2 (for SIP-T21(P) E2)
X is equal to 1 (for SIP-T19(P) E2/CP860/CP920)
Example:
account.1.session_timer.expires = 1800
Note: It works only if the value of the parameter "account.X.session_timer.enable" is set to 1
(Enabled).
Web User Interface:
Account->Advanced->Session Expires(30~7200s)
Phone User Interface:
None
account.X.session_timer.refresher 0 or 1 0
Description:
Configures the function of the endpoint who initiates the SIP request for account X.
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