AudioCodes Mediant 2000 User Manual page 110

Parameter
SIP Re-Routing Mode
[IPGroup_SIPReRoutingMode]
Enable Survivability
[IPGroup_EnableSurvivability]
SIP User's Manual

[1] Serving IP Group = The device sends the SIP INVITE to
the selected Serving IP Group. If no Serving IP Group is
selected, the default IP Group is used. If the Proxy server(s)
associated with the destination IP Group is not alive, the
device uses the 'Outbound IP Routing' table (if the
parameter IsFallbackUsed is set 1, i.e., fallback enabled -
refer to Configuring Proxy and Registration Parameters on
page 101).

[2] Request-URI = The device sends the SIP INVITE to the
IP address according to the received SIP Request-URI host
name.
Note: This field is available only if the IP-to-IP application is
enabled.
Determines the routing mode after a call redirection (i.e., a 3xx
SIP response is received) or transfer (i.e., a SIP REFER
request is received).

[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.

Disable (default).

Enable = Survivability mode is enabled. The device records
in its local 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
110
Description
Document #: LTRT-68809
Mediant 2000