Digit Mapping

You can use digit mapping to determine when the device stops collecting the digits of a dialed phone number from the Tel side (caller), after which it uses them for the destination number to establish the call. Digit mapping is typically used for closed numbering schemes.

The device stops collecting digits and starts sending the digits upon any of the following scenarios:

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The maximum number of digits is received: You can configure the maximum number of collected digits that can be received from the Tel side. When the number of collected digits reaches this maximum (or a digit map pattern is matched before the maximum), the device stops collecting more digits and uses the collected digits for the called destination number. To configure the maximum number of collected digits, use the [MaxDigits parameter] parameter.

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The inter-digit timeout expires (e.g., for open numbering schemes): The inter-digit timeout is the time that the device waits between each received (collected) digit. When the timeout expires, the device stops collecting more digits and uses the collected digits for the called destination number. To configure the timeout, use the [TimeBetweenDigits] parameter.

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The digits match one of the digit map patterns: Digit map (pattern) rules are configured by the [DigitMapping] parameter. The digit map pattern can contain up to 52 options (rules), each separated by a vertical bar ("|"). The maximum length of the entire digit pattern is 152 characters. The digit mapping notations are described in the following table:

Digit Map Pattern Notations

Notation	Description
[n-m]	Range of numbers (e.g., "1-7").
.	(Single dot) Repeat digits until the next notation (e.g., T).
x	Any single digit. Note: This notation doesn't apply to some scenarios when using the * or # key. For example, the key sequence of "**" must be presented in the dial plan as "*x.s" (instead of xx).
T	Dial timeout between received digits, which is configured by the [TimeBetweenDigits] parameter.
S	Short timeout between received digits, which is configured by the [TimeBetweenDigits] parameter whose value is then divided by 2. For example, if you leave the parameter at its default (i.e., 4), then the short timeout is 2 (i.e., 4 divided by 2). You can use the short timeout when you configure a specific rule after a more general rule. For example, if the digit map is "99|998", the device terminates digit collection when the first two 9 digits are received. Therefore, the second rule "998" can never be matched. But if you configure the digit map as "99S|998", then after the first two 9 digits are dialed, the device waits another two seconds, within which the caller can dial the digit 8.

Below is an example of a digit map containing eight rules:

DigitMapping = 11xS|00[1-7]xxx|8xxxxxxx|#xxxxxxx|*xx|91xxxxxxxxxx|9011x|9011x.T

In the example, the rule:

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"00[1-7]xxx" denotes dialed numbers that begin with 00, and then any digit from 1 through 7, followed by three digits (of any number). Once the device receives these digits, it doesn't wait for additional digits, but starts sending the collected digits (dialed number) immediately.

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"9011x.T" can apply to International numbers where 9 is for the dialing tone, 011 the country code, and then any number of digits for the local number.

Digit maps are used for Tel-to-IP ISDN overlap dialing (by configuring the [ISDNRxOverlap] parameter to 1) to reduce the dialing period. For more information, see ISDN Overlap Dialing.