Configuring Advanced Features
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that was used. If the primary server does not respond correctly, the IP phone will try to send
requests to the secondary server.
1-DNSTTL: the IP phone will send requests to the last registered server first. If the TTL for
the DNS A records 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 parameter “account.X.sip_server.Y.failback_timeout” expires, the phone will
retry to send requests to the primary server.
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, etc.).
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)
0, Integer from 60
to 65535
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 for account X.
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.
If you set the parameter from 1 to 59, the timeout will be 60 seconds.
Note: It works only if the value of the parameter “account.X.sip_server.Y.failback_mode” is
set to 3 (duration).
Web User Interface:
None
Phone User Interface:
None
To configure server redundancy for fallback purpose via web user interface:
1. Click on Account->Register.
2. Select the desired account from the pull-down list of Account.
3. Configure registration parameters of the selected account in the corresponding fields.
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