SIP User's Manual 344 Document #: LTRT-83310
Mediant 600 & Mediant 1000
18.7 Dialing Plan Features
This section discusses various dialing plan features supported by the device:
Digit mapping (see 'Digit Mapping' on page 344)
External Dial Plan file containing dial plans (see 'External Dial Plan File' on page 345)
Dial plan prefix tags for enhanced IP-to-Tel routing (see Dial Plan Prefix Tags for IP-
to-Tel Routing on page 348)
18.7.1 Digit Mapping
Digit map pattern rules are used for Tel-to-IP ISDN overlap dialing (by setting the
ISDNRxOverlap parameter to 1) to reduce the dialing period (for digital interface). For more
information on digit maps for ISDN overlapping, see ISDN Overlap Dialing on page 246.
The device collects digits until a match is found in the user-defined digit pattern (e.g., for
closed numbering schemes). The device stops collecting digits and starts sending the
digits (collected number) when any one of the following scenarios occur:
Maximum number of digits is received. You can define (using the MaxDigits
parameter) the maximum number of collected destination number digits that can be
received (i.e., dialed) from the Tel side by the device. When the number of collected
digits reaches the maximum (or a digit map pattern is matched), the device uses these
digits for the called destination number.
Inter-digit timeout expires (e.g., for open numbering schemes). This is defined using
the TimeBetweenDigits parameter. This is the time that the device waits between each
received digit. When this inter-digit timeout expires, the device uses the collected
digits to dial the called destination number.
The phone's pound (#) key is pressed.
Digit string (i.e., dialed number) matches one of the patterns defined in the digit map.
Digit map (pattern) rules are defined using 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 available notations are
described in the table below:
Table 18-23: Digit Map Pattern Notations
Notation Description
[n-m]
Range of numbers (not letters).
.
(single dot) Repeat digits until next notation (e.g., T).
x
Any single digit.
T
Dial timeout (configured by the TimeBetweenDigits parameter).
S
Short timer (configured by the TimeBetweenDigits parameter; default is two
seconds) that can be used when a specific rule is defined after a more general
rule. For example, if the digit map is 99|998, then the digit collection is
terminated after the first two 9 digits are received. Therefore, the second rule
of 998 can never be matched. But when the digit map is 99s|998, then after
dialing the first two 9 digits, the device waits another two seconds within which
the caller can enter the digit 8.
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