If an IP phone loses connectivity with its primary server and registers with its backup server, what happens when connectivity to the primary server is restored?
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The IP phone will try to re-establish a connection to the primary server every 90 seconds.
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The IP phone will continuously try to re-establish a connection with the primary server; if successful, the IP phone will re-register with the primary.
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Once the IP phone registers with the backup server, the administrator will need to reset the IP phone for it to re-register with the primary server.
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Once connectivity is re-established with the primary server, the IP phone will wait until there have been three successful TCP keepalive exchanges before it will reregister with the primary server.
