Yealink SIP-T4U Series User Manual

Administrator’s Guide for SIP-T2 Series/T4 Series/T5 Series/CP920 IP Phones
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Description
It enables or disables the phone to only send requests to the registered outbound proxy server when
encountering a failover.
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
Values
0-Disabled
1-Enabled
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
[1][2]
<MAC>.cfg
Description
It configures the number of retries attempted before sending requests to the next available outbound
proxy server when encountering a failover.
Permitted
Values
Integer from 1 to 10
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
[1][2]
<MAC>.cfg
Description
It configures the failback mode for the phone to retry the primary outbound proxy server in failover.
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).
Permitted
Values
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
requests to the primary outbound proxy server.
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
[1][2]
<MAC>.cfg
Description
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
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
Values
0, Integer from 60 to 65535
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
[1][2]
<MAC>.cfg
Description
It enables or disables the phone to retry to re-subscribe after registering to the secondary outbound
proxy server with different IP addresses when encountering a failover.
Note: It works only if “account.X.outbound_proxy.Y.failback_mode” is set to 1, 2 or 3.
Permitted
Values
0-Disabled
1-Enabled, the phone will immediately re-subscribe to the secondary outbound proxy server, for ensur-

Yealink SIP-T4U Series Specifications

General

Brand	Yealink
Model	SIP-T4U Series
Category	IP Phone
Language	English