Medias Mediatrix 1204, Reference Manual

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Mediatrix 1204 243
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H A P T E R
21
Digit Maps
This chapter describes how to use a digit map.
You can also set these parameters via the web interface, as described in “Digit Maps” on page 73 .
What is a Digit Map?
A digit map allows you to compare the number users just dialed to a string of arguments. If they match, users
can make the call. If not, users cannot make the call and get an error signal. It is thus essential to define very
precisely a digit map before actually implementing it, or your users may encounter calling problems.
Because the Mediatrix 1204 cannot predict how many digits it needs to accumulate before transmission, you
could use the digit map, for instance, to determine exactly when there are enough digits entered from the user
to place a call.
Syntax
The permitted digit map syntax is taken from the core MGCP specification, RFC 2705, section 3.4:
DigitMap = DigitString / '(' DigitStringList ')'
DigitStringList = DigitString 0*( '|' DigitString )
DigitString = 1*(DigitStringElement)
DigitStringElement = DigitPosition ['.']
DigitPosition = DigitMapLetter / DigitMapRange
DigitMapLetter = DIGIT / '#' / '*' / 'A' / 'B' / 'C' / 'D' / 'T'
DigitMapRange = 'x' / '[' 1*DigitLetter ']'
DigitLetter ::= *((DIGIT '-' DIGIT ) / DigitMapLetter)
Where “x” means “any digit” and “.” means “any number of”.
For instance, using the telephone on your desk, you can dial the following numbers:
Standards Supported RFC 2705 – Media Gateway Control Protocol (MGCP) Version 1.0,
section 3.4 (Formal syntax description of the protocol).
In the Unit Manager Network Administration Manual , refer to chapter Dial Map Parameters .
Note:
The digit maps apply only on SCN to IP network calls. They are used on the second – IP – dial tone.
Table 156: Number Examples
Number Description
0 Local operator
00 Long distance operator
xxxx Local extension number
8xxxxxxx Local number
#xxxxxxx Shortcut to local number at other corporate sites