Datasets:
Squidnutz
/
extractedtest

Dataset card Data Studio Files
xet
 Community
1
text
stringlengths
0
152
exten => example,1,Set(__MyVariable=thisValue)
100
|
Chapter 6: Dialplan Basics
When you wish to read the value of the channel variable, you do not use the
underscore(s):
exten => example,1,Verbose(1,Value of MyVariable is: ${MyVariable})
Pattern Matching
If we want to be able to allow people to dial through Asterisk and have Asterisk con‐
nect them to outside resources, we need a way to match on any possible phone num‐
ber that the caller might dial. For situations like this, Asterisk offers pattern matching.
Pattern matching allows you to create one extension in your dialplan that matches
many different numbers. This is enormously useful.
Pattern-matching syntax
When we are using pattern matching, certain letters and symbols represent what we
are trying to match. Patterns always start with an underscore (_). This tells Asterisk
that we’re matching on a pattern, and not on an explicit extension name.
If you forget the underscore at the beginning of your pattern,
Asterisk will think it’s just a named extension and won’t do any pat‐
tern matching. This is one of the most common mistakes people
make when starting to learn Asterisk.
After the underscore, you can use one or more of the following characters:
X
Z
N
Matches any single digit from 0 to 9.
Matches any single digit from 1 to 9.
Matches any single digit from 2 to 9.
Another common mistake is to try to use the letters X, Z, and N
literally in a pattern match; to do that, wrap them in square
brackets (case-insensitive), such as _ale[X][Z]a[N]der.
[15-7]
Matches a single character from the range of digits specified. In this case, the pat‐
tern matches a single 1, as well as any number in the range 5, 6, 7.
Building an Interactive Dialplan
|
101
. (period)
Wildcard match; matches one or more characters, no matter what they are.
If you’re not careful, wildcard matches can make your
dialplans do things you’re not expecting (like matching built-
in extensions such as i or h). You should use the wildcard
match in a pattern only after you’ve matched as many other
digits as possible. For example, the following pattern match
should probably never be used:
_.
In fact, Asterisk will warn you if you try to use it. Instead, if
you really need a catchall pattern match, use this one to match
all strings that start with a digit followed by one or more char‐
acters (see ! if you want to be able to match on zero or more
characters):
_X.
Or this one, to match any alphanumeric string:
_[0-9a-zA-Z].
! (bang)
Wildcard match; matches zero or more characters, no matter what they are.
To use pattern matching in your dialplan, simply put the pattern in the place of the
extension name (or number):
exten => _4XX,1,Noop(User Dialed ${EXTEN})
same => n,Answer()
same => n,SayDigits(${EXTEN})
same => n,Hangup()
In this example, the pattern matches any three-digit extension from 400 through
499.18