AudioCodes Mediant 800 MSBG User Manual page 124

Parameter
Enable Survivability
[IPGroup_EnableSurvivability]
SIP User's Manual
[0] Standard = INVITE messages that are generated as a
result of Transfer or Redirect are sent directly to the URI,
according to the Refer-To header in the REFER message or
Contact header in the 3xx response (default).
[1] Proxy = Sends a new INVITE to the Proxy.
Note: Applicable only if a Proxy server is used and the
parameter AlwaysSendtoProxy is set to 0.
[2] Routing Table = Uses the Routing table to locate the
destination and then sends a new INVITE to this destination.
Notes:
When this parameter is set to [1] and the INVITE sent to the
Proxy fails, the device re-routes the call according to the
Standard mode [0].
When this parameter is set to [2] and the INVITE fails, the
device re-routes the call according to the Standard mode
[0]. If DNS resolution fails, the device attempts to route the
call to the Proxy. If routing to the Proxy also fails, the
Redirect / Transfer request is rejected.
When this parameter is set to [2], the XferPrefix parameter
can be used to define different routing rules for redirected
calls.
This parameter is ignored if the parameter
AlwaysSendToProxy is set to 1.
Determines whether Survivability mode is enabled for USER-
type IP Groups.
[0] Disable (default).
[1] Enable if Necessary = Survivability mode is enabled. The
device records in its database the registration messages
sent by the clients belonging to the USER-type IP Group. If
communication with the Serving IP Group (e.g., IP-PBX)
fails, the USER-type IP Group enters into Survivability mode
in which the device uses its database for routing calls
between the clients (e.g., IP phones) of the USER-type IP
Group. The RTP packets between the IP phones in
Survivability mode always traverse through the device. In
Survivability mode, the device is capable of receiving new
registrations. When the Serving IP Group is available again,
the device returns to normal mode, sending INVITE and
REGISTER messages to the Serving IP Group.
[2] Always Enable = Survivability mode is always enabled.
The communication with the Serving IP Group (e.g., IP-PBX)
is always considered as failed. The device uses its database
for routing calls between the clients (e.g., IP phones) of the
USER-type IP Group.
Notes:
This field is available only if the SBC or IP-to-IP application
is enabled. (The IP-to-IP application will be supported in the
next applicable release.)
This parameter is applicable only to USER-type IP Groups.
124
Mediant 800 MSBG
Description
Document #: LTRT-12804