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Understanding Digit Manipulation

This topic describes digit manipulation and the commands that are used to connect to a

specified destination.

Cisco Public

IP Telephony

Digit Manipulation Commands

• prefix

Dial-peer command

Adds digits to the front of the dial string before it is forwarded to

the telephony interface

• forward-digits

Dial-peer command

Controls the number of digits forwarded to the telephony interface

• num-exp

Global command

Expands an extension into a full telephone number or replaces

one number with another

• translation-rule

Global and dial-peer command

Digit translation rules used to manipulate the calling number digits,

or ANI, or the called number digits, or DNIS, for a voice call

Digit manipulation is the task of adding or subtracting digits from the original dialed number to

accommodate user dialing habits or gateway needs. The digits can be manipulated before

matching an inbound or outbound dial peer. The following is a list of digit manipulation

commands and their uses:

 prefix: This dial-peer command adds digits to the front of the dial string before it is

forwarded to the telephony interface. This occurs after the outbound dial peer is matched,

but before digits get sent out of the telephony interface. Use the prefix command when the

dialed digits leaving the router must be changed from the dialed digits that had originally

matched the dial peer; for example, a call is dialed using a four-digit extension such as

0123, but the call needs to be routed to the PSTN, which requires ten-digit dialing. If the

four-digit extension matches the last four digits of the actual PSTN telephone number, then

you can use the prefix 902555 command to prepend the six additional digits needed for the

PSTN to route the call to 902-555-0123. After the POTS dial peer is matched with the

destination pattern of 0123, the prefix command prepends the additional digits, and the

string “9025550123” is sent out of the voice port to the PSTN.

 forward-digits: This dial-peer command specifies the number of digits that must be

forwarded to the telephony interface, regardless of whether they are explicitly matched or

wildcard matched. This command occurs after the outbound dial peer is matched, but

before the digits are sent out of the telephony interface. When a specific number of digits

are configured for forwarding, the count is right justified. For example, if the POTS dial

peer has a destination pattern configured to match all extensions in the 1000 range

(destination-pattern 1…), by default, only the last three digits are forwarded to the PBX

that is connected to the specified voice port. If the PBX needs all four digits to route the

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