CounterPath Bria Professional 2.5 Configuration Guide - Manual (Page 12)

CounterPath Corporation
8
Pattern
Valid Content
The content for a pattern follows the digit map rules of RFC 2705, supplemented by the rules for regular
expressions. Where there is an overlap between the digit map and regular expression rules, the digit map rules
apply. For this reason, there are some special cases, included in the table below.
The following table describes the most common elements. As mentioned, all regular expression elements are
supported.
Timers
There are two timers, the T timer and the long timer. These timers are used in input comparison, as described in
“How the Input Is Processed” on page 9.
Both timers can be configured via the Bria Professional settings:
Some elements use the back slash \ character. If you are defining pattern a via remote provisioning (that is, in an
HTTP response), you must enter two backslashes, because the Bria Professional provisioning software
interprets one backslash as an escape key.
Element Origin Description
0 1 2 3 4 5 6 7 8 9 Literals Literal digits, used as is.
# * a to z Literals Literal characters, used as is. Special cases:
• The literal x character is represented by \x.
• The literal t character is represented by \t.
x Digit map rules Wildcard for any single digit, 0 to 9.
\a Regular expression
rules Wildcard for any single alphanumeric character.
[digit-digit] Regular expression
rules A digit within the specified range.
[character-
character] Regular expression
rules A character within the specified range.
[digit1, digit2,
digit3] Regular expression
rules One of the characters in the collection.
. Digit map rules Repeat the last element 0 or more times. Use of this element results in a pattern with
"minimum requirements". For example, xxxx. means repeat the last x 0 or more times,
which means this pattern matches three or more digits (not four or more digits)! Use
of this element results in a pattern with "minimum requirements".
T Digit map rules A timeout period will take place before automatic dialing starts.
The typical timer value is 4 seconds, but a different value can be set in the setting
proxies:common:digit_map_timer_critical.
The T timer forces Bria Professional to wait after a match is made. This timer should
always be included in the following situations:
• Any pattern that uses the . (dot). For example, if the pattern is xxxx. then adding a
timer allows the user to type three or more digits. If there is no timer, then Bria
Professional makes the match as soon as the user types three digits.
• Any dial plan that has two patterns that are similar in elements but different in
length. For example, if one pattern is xxx and the other pattern is xxxxxxx, then
adding the timer allows the user to continue typing past three digits, in order to get
a match on the second pattern.
In this situation, the T timer should be included in the shorter pattern.