Configures the way in which the phone fails
back to the primary server for call control
when in the failover mode.
X ranges from 1 to 6.
Y ranges from 1 to 2.
Valid values are:
0-newRequests: all requests are forwarded
to the primary server first, regardless of the
secondary server that was used.
1-DNSTTL: the IP phone will retry to use the
primary server after the timeout of the
DNSTTL configured for the SIP server.
2-registration: the IP phone will retry to use
the primary server when the SIP server’s
registration requires renewal.
3-duration: the IP phone will retry to use the
primary server after the timeout defined by
the account.x.failback_timeout parameter.
Configures the time interval (in seconds) for
the IP phone to detect whether the primary
server is available by sending the
registration request after the secondary
server takes over the call control.