DRAFT
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Digit Sequence Syntax:
Each digit sequence within the dial plan consists of a series of elements, which are individually matched
to the keys pressed by the user. Elements can be one of the following:
Individual keys ‘0’, ‘1’, ‘2’ . . . ‘9’, ‘*’, ‘#’.
The letter ‘x’ matches any one numeric digit (‘0’ .. ‘9’)
A subset of keys within brackets (allows ranges): ‘[‘ set ‘]’ (e.g. [389] means ‘3’ or ‘8’ or ‘9’)
Numeric ranges are allowed within the brackets: digit ‘-‘ digit (e.g. [2-9] means ‘2’ or ‘3’ or … or ‘9’)
Ranges can be combined with other keys: e.g. [235-8*] means ‘2’ or ‘3’ or ‘5’ or ‘6’ or ‘7’ or ‘8’ or ‘*’.
Element repetition:
Any element can be repeated zero or more times by appending a period (‘.’ character) to the element.
Hence, “01.” matches “0”, “01”, “011”, “0111”, … etc.
Subsequence Substitution:
A subsequence of keys (possibly empty) can be automatically replaced with a different subsequence
using an angle bracket notation: ‘<’ dialed-subsequence ‘:’ transmitted-subsequence ‘>’. So, for example,
“<8:1650>xxxxxxx” would match “85551212” and transmit “16505551212”.
Intersequence Tones:
An “outside line” dial tone can be generated within a sequence by appending a ‘,’ character between
digits. Thus, the sequence “9, 1xxxxxxxxxx” sounds an “outside line” dial tone after the user presses ‘9’,
until the ‘1’ is pressed.
Number Barring:
A sequence can be barred (rejected) by placing a ‘!’ character at the end of the sequence. Thus,
“1900xxxxxxx!” automatically rejects all 900 area code numbers from being dialed.
Interdigit Timer Master Override:
The long and short interdigit timers can be changed in the dial plan (affecting a specific line) by preceding
the entire plan with the following syntax:
Long interdigit timer: ‘L’ ‘:’ delay-value ‘,’
Short interdigit timer: ‘S’ ‘:’ delay-value ‘,’
Thus, “L=8,( . . . )” would set the interdigit long timeout to 8 seconds for the line associated with this dial
plan. And, “L:8,S:4,( . . . )” would override both the long and the short timeout values.
Local Timer Overrides:
The long and short timeout values can be changed for a particular sequence starting at a particular point
in the sequence. The syntax for long timer override is: ‘L’ delay-value ‘ ‘. Note the terminating space
character. The specified delay-value is measured in seconds. Similarly, to change the short timer
override, use: ‘S’ delay-value <space>.
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