Yealink SIP-T2 Series Administrator's Manual page 216

Administrator's Guide for SIP-T2 Series/T4 Series/T5 Series/CP920 IP Phones
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.
Default 0
Parameter account.X.sip_server.Y.failback_timeout
It configures the timeout (in seconds) for the IP phone to retry to send requests to the primary server after
failing over to the current working server.
If you set the parameter to 0, the IP phone will not send requests to the primary server until a failover
Description
event occurs with the current working server.
If you set the parameter between 1 and 59, the timeout will be 60 seconds.
Note: It works only if ""account.X.sip_server.Y.failback_mode" is set to 3 (duration).
Permitted
0, Integer from 60 to 65535
Values
Default 3600
account.X.sip_server.Y.failback_subscribe.enable
Parameter
[2]
It enables or disables the IP phone to retry to re-subscribe after registering to the secondary server with
different IP addresses when encountering a failover.
Description
Note: It works only if "account.X.sip_server.Y.failback_mode" is set to 1, 2 or 3.
0-Disabled
Permitted
1-Enabled, the IP phone will immediately re-subscribe to the secondary server, for ensuring the normal
Values
use of the features associated with the subscription (for example, BLF, SCA).
Default 0
account.X.outbound_proxy.Y.register_on_enable
Parameter
[2]
It enables or disables the IP phone to register to the secondary outbound proxy server before sending
Description
requests to it when encountering a failover.
0-Disabled, the IP phone will not attempt to register to the secondary outbound proxy server, since the
phone assumes that the primary and secondary outbound proxy servers share registration information. So
Permitted
the IP phone will directly send the requests to the secondary outbound proxy server.
Values
1-Enabled, the IP phone will register to the secondary outbound proxy server first, and then send the
requests to it.
Default -1, the IP phone will invoke "account.X.sip_server.Y.register_on_enable" to take effect.
Parameter account.X.outbound_proxy.Y.retry_counts
It configures the retry times for the IP phone to resend requests when the outbound proxy server Y is
unavailable or there is no response from the outbound proxy server Y.
Description
Example:
account.1.outbound_proxy.1.retry_counts = 3
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<MAC>.cfg
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<MAC>.cfg
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<MAC>.cfg
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<MAC>.cfg