Yealink SIP-T48G Administrator's Manual page 406

Administrator's Guide for SIP-T2_Series_T4_Series IP Phones
requests to the primary server.
2-Registration: the IP phone will send requests to the last registered server first. If the
registration expires, the phone will retry to send requests to the primary server.
3-duration: the IP phone will send requests to the last registered server first. If the
time defined by the "account.X.sip_server.Y.failback_timeout" parameter expires,
the phone will retry to send requests to the primary server.
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-T23P/G).
X ranges from 1 to 2 (for SIP-T21(P) E2).
Web User Interface:
None
Phone User Interface:
None
account.X.sip_server.Y.failback_timeout
(X ranges from 1 to 16, Y ranges from 1 to 2)
Description:
Configures the time (in seconds) for the phone to retry to send requests to the
primary server after failing over to the current working server when the parameter
"account.X.sip_server.Y.failback_mode" is set to 3 (duration).
If you set the parameter to 0, the IP phone will not send requests to the primary
server until a failover event occurs with the current working server.
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-T23P/G).
X ranges from 1 to 2 (for SIP-T21(P) E2).
Web User Interface:
None
Phone User Interface:
None
account.X.sip_server.Y.register_on_enable
(X ranges from 1 to 16, Y ranges from 1 to 2)
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Parameters Permitted Values Default
0, 60 to 65535 3600
0 or 1 0