AudioCodes Mediant 800B User Manual page 556

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Destination Phone Number Manipulation for IP-to-Tel Calls (up to 120 entries)
Configuration of number manipulation rules includes two areas:

Match: Defines the matching characteristics of the incoming call (e.g., prefix of
destination number).

Action: Defines the action that is done if the incoming call matches the characteristics
of the rule (e.g., removes a user-defined number of digits from the left of the number).
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 applies the manipulation
configured for that rule. In other words, a rule at the top of the table takes precedence over
a rule defined lower down in the table. Therefore, define more specific rules above more
generic rules. For example, if you configure the source prefix number as "551" for rule
index 1 and "55" for rule index 2, the device uses rule index 1 for numbers that start with
551 and uses rule index 2 for numbers that start with 550, 552, 553, and so on until 559.
However, if you configure the source prefix number as "55" for rule index 1 and "551" for
rule index 2, the device applies rule index 1 to all numbers that start with 55, including
numbers that start with 551. If the device doesn't find a matching rule, no manipulation is
done on the call.
You can perform a second "round" (additional) of source and destination number
manipulations for IP-to-Tel calls on an already manipulated number. The initial and
additional number manipulation rules are both configured in the number manipulation
tables for IP-to-Tel calls. The additional manipulation is performed on the initially
manipulated number. Thus, for complex number manipulation schemes, you only need to
configure relatively few manipulation rules in these tables (that would otherwise require
many rules). To enable this additional manipulation, use the following parameters:

Source number manipulation - PerformAdditionalIP2TELSourceManipulation

Destination number manipulation - PerformAdditionalIP2TELDestinationManipulation
Telephone number manipulation can be useful, for example, for the following:

Stripping or adding dialing plan digits from or to the number, respectively. For
example, a user may need to first dial 9 before dialing the phone number to indicate
an external line. This number 9 can then be removed by number manipulation before
the call is setup.

Allowing or blocking Caller ID information according to destination or source prefixes.
For more information on Caller ID, see Configuring Caller Display Information on page
636.

For digital interfaces only: Assigning Numbering Plan Indicator (NPI) and Type of
Numbering (TON) to IP-to-Tel calls. The device can use a single global setting for
NPI/TON classification or it can use the setting in the manipulation tables on a call-by-
call basis.
Note:
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Number manipulation can be performed before or after a routing decision is made.
For example, you can route a call to a specific Trunk Group according to its
original number, and then you can remove or add a prefix to that number before it
is routed. To determine when number manipulation is performed, use the 'IP to Tel
Routing Mode' parameter (RouteModeIP2Tel) and 'Tel to IP Routing Mode'
parameter (RouteModeTel2IP).
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The device manipulates the number in the following order: 1) strips digits from the
left of the number, 2) strips digits from the right of the number, 3) retains the
defined number of digits, 4) adds the defined prefix, and then 5) adds the defined
suffix.
User's Manual
Mediant 800B Gateway & E-SBC
556 Document #: LTRT-10632