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?
A.
The IP phone will try to re-establish a connection to the primary server every 90 seconds.
B.
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.
C.
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.
D.
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 re-register with the primary server.