AudioCodes Mediant 800B MSBR User Manual page 277

User's Manual
Parameter
Enable Survivability
CLI: enable-survivability
[IPGroup_EnableSurvivability]
Version 6.8

[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.

[1] Proxy = Sends a new INVITE to the Proxy. This is
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.
Defines how the device handles registration messages and
whether Survivability mode is enabled for User-type IP
Groups.

[0] Disable (default).

[1] Enable if Necessary = Survivability mode is enabled
only if the Serving IP Group is unavailable. The device
saves in its Registration database the registration
messages sent by the clients (e.g., IP phones)
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 of the User-type IP Group. In Survivability mode,
the RTP packets between the clients always traverse
through the device, and new registrations can also be
processed. 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
is always considered as failed. The device uses its
database for routing calls between the clients of the
User-type IP Group.

[3] Always Terminate Register = The registration
messages received from the clients are saved in the
device's registration database without forwarding them
to the proxy server. Upon receipt of the registration
message, the device returns a SIP 200 OK to the client.
277
21. Control Network
Description
Mediant 800B MSBR