Yealink SIP-T3 Administrator's Manual page 347

Values
Default -1, the phone will invoke "account.X.sip_server.Y.retry_counts" to take effect.
Parameter account.X.outbound_proxy.Y.only_signal_with_registered
It enables or disables the phone to only send requests to the registered outbound proxy server when
encountering a failover.
Description
Note: It works only if "account.X.outbound_proxy.Y.register_on_enable" is set to 1 (Enabled) and
"account.X.outbound_proxy.Y.failback_mode" is set to 1, 2 or 3.
Permitted 0-Disabled
1-Enabled
Values
Default -1, the phone will invoke "account.X.sip_server.Y.only_signal_with_registered" to take effect.
Parameter account.X.outbound_proxy.Y.invite_retry_counts
It configures the number of retries attempted before sending requests to the next available outbound
Description
proxy server when encountering a failover.
Permitted
Integer from 1 to 10
Values
Default -1, the phone will invoke "account.X.sip_server.Y.invite_retry_counts" to take effect.
Parameter account.X.outbound_proxy.Y.failback_mode
It configures the failback mode for the phone to retry the primary outbound proxy server in failover.
Description
Note: DNSTTL, Registration and duration mode can only be processed when the IP phone is idle (that
is, no incoming/outbound calls, no active calls or meetings, and so on).
0-newRequests: all requests are sent to the primary outbound proxy server first, regardless of the last
server that was used. If the primary outbound proxy server does not respond correctly, the phone will
try to send requests to the secondary outbound proxy server.
1-DNSTTL: the phone will send requests to the last registered outbound proxy server first. If the TTL
for the DNS A records on the registered outbound proxy server expires, the phone will retry to send
Permitted
requests to the primary outbound proxy server.
Values
2-Registration: the phone will send requests to the last registered outbound proxy server first. If the
registration expires, the phone will retry to send requests to the primary outbound proxy server.
3-duration: the phone will send requests to the last registered outbound proxy server first. If the time
defined by the parameter "account.X.outbound_proxy.Y.failback_timeout" expires, the phone will retry
to send requests to the primary outbound proxy server.
Default -1, the phone will invoke "account.X.sip_server.Y.failback_mode" to take effect.
Parameter account.X.outbound_proxy.Y.failback_timeout
It configures the timeout (in seconds) for the phone to retry to send requests to the primary outbound
proxy server after failing over to the current working server.
If you set the parameter to 0, the phone will not send requests to the primary outbound proxy server
Description
until a failover event occurs with the current working server.
Note: It works only if "account.X.outbound_proxy.Y.failback_mode" is set to 3 (duration).
Permitted
0, Integer from 60 to 65535
Values
Default -1, the phone will invoke "account.X.sip_server.Y.failback_timeout" to take effect.
Parameter account.X.outbound_proxy.Y.failback_subscribe.enable
Description It enables or disables the phone to retry to re-subscribe after registering to the secondary outbound
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<MAC>.cfg
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<MAC>.cfg
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<MAC>.cfg
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<MAC>.cfg
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<MAC>.cfg
Account Settings
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