Yealink SIP-T48G Administrator's Manual page 318

Administrator's Guide for SIP-T2 Series/T19(P) E2/T4 Series/CP860 IP Phones
account.X.session_timer.expires
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-T48G/T46G/T29G)
X ranges from 1 to 12 (for SIP-T42G)
X ranges from 1 to 6 (for SIP-T41P/T27P)
X ranges from 1 to 3 (for SIP-T40P/T23P/T23G)
X ranges from 1 to 2 (for SIP-T21(P) E2)
X is equal to 1 (for SIP-T19(P) E2/CP860)
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
Description:
Configures the function of the endpoint who initiates the SIP request for account X.
0-UAC
1-UAS
X ranges from 1 to 16 (for SIP-T48G/T46G/T29G)
X ranges from 1 to 12 (for SIP-T42G)
X ranges from 1 to 6 (for SIP-T41P/T27P)
X ranges from 1 to 3 (for SIP-T40P/T23P/T23G)
X ranges from 1 to 2 (for SIP-T21(P) E2)
X is equal to 1 (for SIP-T19(P) E2/CP860)
Note: It works only if the value of the parameter "account.X.session_timer.enable" is
set to 1 (Enabled).
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Parameters Permitted Values Default
Integer from 30
1800
to 7200
0 or 1 0