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Applications Notes D-13

| 00 | Long distance operator |

| xxxx | Local extension number |

| 8xxxxxxx | Local number |

| #xxxxxxx | Shortcut to local number at|

| | other corporate sites |

| *xx | Star services |

| 91xxxxxxxxxx | Long distance number |

| 9011 + up to 15 digits| International number |

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The solution to this problem is to have the Call Agent load the gateway with a

digit map that may correspond to the dial plan. This digit map is expressed

using a syntax derived from the Unix system command, egrep. For example,

the dial plan described above results in the following digit map:

(0T|00T|[1-7]xxx|8xxxxxxx|#xxxxxxx|*xx|91xxxxxxxxxx|

9011x.T)

The formal syntax of the digit map is described by the DigitMap rule in the

formal syntax description of the protocol − support for basic digit map letters

is REQUIRED while support for extension digit map letters is OPTIONAL. A

gateway receiving a digit map with an extension digit map letter not

supported SHOULD return error code 537 (unknown digit map extension).

A digit map, according to this syntax, is defined either by a (case insensitive)

"string" or by a list of strings. Each string in the list is an alternative

numbering scheme, specified either as a set of digits or timers, or as an

expression over which the gateway will attempt to find a shortest possible

match. The following constructs can be used in each numbering scheme:

* Digit: A digit from "0" to "9".

* Timer: The symbol "T" matching a timer expiry.

* DTMF: A digit, a timer, or one of the symbols "A",

"B", "C",

"D", "#", or "*". Extensions may be defined.

* Wildcard: The symbol "x" which matches any digit ("0"

to "9").

* Range: One or more DTMF symbols enclosed between

square brackets

("[" and "]").

* Subrange: Two digits separated by hyphen ("-") which

matches any

digit between and including the two. The

subrange

construct can only be used inside a range

construct,

i.e., between "[" and "]".

* Position: A period (".") which matches an arbitrary

number,

including zero, of occurrences of the preceding

construct.

A gateway that detects events to be matched against a digit map MUST

do the following:

1 Add the event code as a token to the end of an internal state variable for

the endpoint called the "current dial string".

2 Apply the current dial string to the digit map table, attempting a match to

each expression in the digit map.

1 2 ... 300 301 302 303 304 305 306 307 308 309 310 311

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