AudioCodes Mediant 1000B User Manual page 512

The device searches the table from top to bottom for the first rule that matches the
characteristics of the incoming call. If it finds a matching rule, it sends the call to the IP
destination configured for that rule. If it doesn't find a matching rule, it rejects the call.
In addition to normal Tel-to-IP routing, you can configure the following features:

Least Cost Routing (LCR): If the LCR feature is enabled, the device searches the
routing table for matching routing rules and then selects the one with the lowest call
cost. The call cost of the routing rule is done by assigning it a Cost Group. To
configure Cost Groups, see ''Least Cost Routing'' on page 267. If two routing rules
have identical costs, the rule appearing higher up in the table (i.e., first-matched rule)
is used. If a selected route is unavailable, the device uses the next least-cost routing
rule. However, even if a matched rule is not assigned a Cost Group, the device can
select it as the preferred route over other matched routing rules with Cost Groups,
according to the optional, default LCR settings configured by the Routing Policy (see
''Configuring a Gateway Routing Policy Rule'' on page 525).

Call Forking: If the Tel-to-IP Call Forking feature is enabled, the device can send a
Tel call to multiple IP destinations. An incoming Tel call with multiple matched routing
rules (e.g., all with the same source prefix numbers) can be sent (forked) to multiple IP
destinations if all these rules are configured with a Forking Group. The call is
established with the first IP destination that answers the call.

Call Restriction: Calls whose matching routing rule is configured with the destination
IP address of 0.0.0.0 are rejected.
User's Manual
Figure 24-1: Locating SRD
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Mediant 1000B Gateway & E-SBC
Document #: LTRT-27055