Yealink SIP-T2 Series Administrator's Manual page 350

Administrator's Guide for SIP-T23 & T23P & T23G IP Phones
control in the failover mode.
0-newRequests: all requests are sent to the primary server first, regardless of the last
server that was used.
1-DNSTTL: the IP phone will send requests to the last registered server first. If the time
defined by DNSTTL on the registered server expires, the phone will retry to send
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.
Web User Interface:
None
Phone User Interface:
None
account.X.sip_server.Y.failback_timeout
(X ranges from 1 to 3, 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 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.
Web User Interface:
None
Phone User Interface:
None
account.X.sip_server.Y.register_on_enable
(X ranges from 1 to 3, Y ranges from 1 to 2)
Description:
Enables or disables the IP phone to register to the secondary server when sending
requests to the secondary server in the failover mode.
0-Disabled
1-Enabled
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Parameters Permitted Values Default
0, 60 to 65535 3600
0 or 1 0