AudioCodes Mediant 800B User Manual page 493

User's Manual
Parameter
Cost Group
cost-group-id
[PREFIX_CostGroup]
Version 7.2
Forking Group "1": The device first sends the call according to
index entries 1, 3, and 4 (all belonging to Forking Group "1"),
and if the destination is unavailable and alternative routing is
enabled, the device sends the call according to index entry 2.

Table index entry 1 is defined with Forking Group "1", index
entry 2 with Forking Group "3", index entry 3 with Forking
Group "2", and index entry 4 with Forking Group "1": The
device first sends the call according to index entries 1 and 4
(all belonging to Forking Group "1"), and if the destination is
unavailable and alternative routing is enabled, the device
sends the call according to index entry 2 (Forking Group "3").
Even if index entry 2 is unavailable and alternative routing is
enabled, the device ignores index entry 3 because it belongs
to a Forking Group that is lower than index entry 2.
Note:

To enable Tel-to-IP call forking, set the 'Tel2IP Call Forking
Mode' (Tel2IPCallForkingMode) parameter to Enable.

You can configure the device to immediately send the INVITE
message to the first member of the Forking Group (as in
normal operation) and then only after a user-defined interval,
send the INVITE messages simultaneously to the other
members. If the device receives a SIP 4xx or 5xx in response
to the first INVITE, it immediately sends INVITEs to all the
other members, regardless of the interval. To configure this
feature, see the ForkingDelayTimeForInvite ini file parameter.

You can implement Forking Groups when the destination is an
LDAP server or a domain name using DNS. In such scenarios,
the INVITE is sent to all the queried LDAP or resolved IP
addresses, respectively. You can also use LDAP routing rules
with standard routing rules for Forking Groups.

When the UseDifferentRTPportAfterHold parameter is
enabled, every forked call is sent with a different RTP port.
Thus, ensure that the device has sufficient available RTP ports
for these forked calls.
Assigns a Cost Group to the routing rule for determining the cost
of the call (i.e., Least Cost Routing or LCR).
By default, no value is defined.
To configure Cost Groups, see 'Configuring Cost Groups' on page
271.
Note: To implement LCR and its Cost Groups, you must enable
LCR

To implement LCR and its Cost Groups, the Routing Policy
must be enabled for LCR (see 'Configuring a Gateway Routing
Policy Rule' on page 499). If LCR is disabled, the device
ignores the parameter.

The Routing Policy also determines whether matched routing
rules that are not assigned Cost Groups are considered as a
higher or lower cost route compared to matching routing rules
that are assigned Cost Groups. For example, if the 'Default
Call Cost' parameter in the Routing Policy is configured to
Lowest Cost, even if the device locates matching routing
rules that are assigned Cost Groups, the first-matched routing
493
Description
Mediant 800B Gateway & E-SBC
23. Routing