User guide

Yealink SIP-T4X IP Phones Auto Provisioning Guide
118
X ranges from
1 to 3.)
When the working server fails, the
phone registers to the fallback server.
The default value is 0.
account.X.fall
back.timeout
=
(SIP-T46G: X
ranges from 1
to 6.
SIP-T42G/T41P:
X ranges from
1 to 3.)
Integer
from 10 to
2147483647
It configures the time interval (in
seconds) for the phone to detect
whether the working server is
available by sending the registration
request after the fallback server takes
over the call control.
It is only applicable to the successive
registration mode.
The default value is 120.
account.X.sip_
server.Y.failba
ck_mode =
(SIP-T46G: X
ranges from 1
to 6.
SIP-T42G/T41P:
X ranges from
1 to 3.
Y ranges from
1 to 2.)
0, 1, 2, or 3
It configures the way in which the
phone fails back to the primary server
for call control when in the failover
mode.
0-newRequests: all requests are
forwarded to the primary server first,
regardless of the secondary server
that was used.
1-DNSTTL: the phone will retry to use
the primary server after the timeout of
the DNSTTL configured for the SIP
server.
2-registration: the phone will retry to
use the primary server when the SIP
server’s registration requires renewal.
3-duration: the phone will retry to use
the primary server after the timeout
defined by the parameter
“account.x.failback_timeout”.
The default value is 0.
account.X.sip_
server.Y.failba
ck_timeout =
(SIP-T46G: X
ranges from 1
to 6.
SIP-T42G/T41P:
X ranges from
1 to 3.
Integer
from 0 to
65535
It configures the time interval (in
seconds) for the phone to detect
whether the primary server is
available by sending the registration
request after the secondary server
takes over the call control.
If the value is configured to 0, the IP
phone does not detect the primary
server until a failover occurs.