AudioCodes Mediant 500 MSBR, User Manual

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Version 7.2 695 Mediant 500 MSBR
User's Manual 37. Routing SBC
LCR Feature
lcr-enable
[SBCRoutingPolicy_LCR
Enable]
Enables the Least Cost Routing (LCR) feature for the Routing Policy.

[0] Disable (default)

[1] Enable
For more information on LCR, see Least Cost Routing on page 245.
Default Call Cost
lcr-default-cost
[SBCRoutingPolicy_LCR
DefaultCost]
Defines whether routing rules in the IP-to-IP Routing table that are not
assigned a Cost Group are considered a higher cost or lower cost route
compared to other matched routing rules that are assigned Cost Groups.

[0] Lowest Cost = (Default) The device considers a matched routing
rule (belonging to the Routing Policy) that is not assigned a Cost
Group as the lowest cost route. Therefore, it uses the routing rule.

[1] Highest Cost = The device considers a matched routing rule
(belonging to the Routing Policy) that is not assigned a Cost Group as
the highest cost route. Therefore, it is only used if the other matched
routing rules that are assigned Cost Groups are unavailable.
Note: If multiple matched routing rules without an assigned Cost Group
exist, the device selects the first matched rule in the table.
LCR Call Duration
lcr-call-length
[SBCRoutingPolicy_LCR
AverageCallLength]
Defines the average call duration (in minutes) and is used to calculate
the variable portion of the call cost. This is useful, for example, when the
average call duration spans over multiple time bands. The LCR is
calculated as follows: cost = call connect cost + (minute cost * average
call duration).
The valid value is 0-65533. The default is 1.
For example, assume the following Cost Groups:

"Weekend A": call connection cost is 1 and charge per minute is 6.
Therefore, a call of 1 minute cost 7 units.

"Weekend B": call connection cost is 6 and charge per minute is 1.
Therefore, a call of 1 minute cost 7 units.
Therefore, for calls under one minute, "Weekend A" carries the lower
cost. However, if the average call duration is more than one minute,
"Weekend B" carries the lower cost.
37.5 Configuring IP Group Sets
The IP Group Set table lets you configure up to 51 IP Group Sets. An IP Group Set is a
group of IP Groups used for load balancing of calls, belonging to the same source, to a call
destination (i.e., IP Group). Each IP Group Set can include up to five IP Groups (Server-
type and/or Gateway-type only). The chosen destination IP Group for each call depends on
the configured load-balancing policy, which can be Round Robin, Random Weights, or
Homing (for more information, see the table's description, later in this section).
Alternative routing within the IP Group Set is also supported, whereby if a chosen
destination IP Group responds with a reject response that is configured as a reason for
alternative routing (see Configuring SIP Response Codes for Alternative Routing Reasons
on page 690) or doesn't respond at all (i.e., keep-alive with its' associated Proxy Set fails),
the device attempts to send the call to another IP Group in the IP Group Set (according to
the load-balancing policy). For enabling Proxy Set keep-alive, see Configuring Proxy Sets
on page 348.
An example of round-robin load-balancing and alternative routing: The first call is sent to IP
Group #1 in the IP Group Set, the second call to IP Group #2, and the third call to IP Group
#3. If the call sent to IP Group #1 is rejected, the device employs alternative routing and
sends it to IP Group #4.