Medias Mediatrix 1204, Reference Manual

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Chapter 5 - Web Interface – Telephony Digit Maps
74 Mediatrix 1204
A Mediatrix 1204 that detects digits or timers applies the current dial string to the digit map, attempting a match
to each regular expression in the digit map in lexical order.
If the result is under-qualified (partially matches at least one entry in the digit map), waits for
more digits.
If the result matches, dials the number.
If the result is over-qualified (i.e., no further digits could possibly produce a match), sends a fast
busy signal.
Special Characters
Digit maps use specific characters and digits in a particular syntax. Those characters are:
How to Use a Digit Map
Let’s say you are in an office and you want to call a co-worker’s 3-digits extension. You could build a digit map
that says “after the user has entered 3 digits, make the call”. The digit map could look as follows:
xxx
You could refine this digit map by including a range of digits. For instance, you know that all extensions in your
company either begin with 2, 3, or 4. The corresponding digit map could look as follows:
[2-4]xx
If the number you dial begins with anything other than 2, 3, or 4, the call is not placed and you get a busy signal.
Combining Several Expressions
You can combine two or more expressions in the same digit map by using the “|” operator, which is equal to
OR.
Let’s say you want to specify a choice: the digit map is to check if the number is internal (extension), or external
(a local call). Assuming that you must first dial “9” to make an external call, you could define a digit map as
follows:
([2-4]xx|9[2-9]xxxxxx)
The digit map checks if:
the number begins with 2, 3, or 4 and
the number has 3 digits
If not, it checks if:
the number begins with 9 and
the second digit is any digit between 2 and 9 and
the number has 7 digits
Table 46: Digit Map Characters
Character Use
Digits (0, 1, 2... 9) Indicates specific digits in a telephone number expression.
T The Timer indicates that if users have not dialed a digit for the time defined, it is likely
that they have finished dialing and the SIP Server can make the call.
x Matches any digit, excluding “#” and “*”.
| Indicates a choice of matching expressions (OR).
. Matches an arbitrary number of occurrences of the preceding digit, including 0.
[ Indicates the start of a range of characters.
] Indicates the end of a range of characters.
Note:
Enclose the digit map in parenthesis when using the “|” option.