[Freeswitch-users] NOT in dialplan expression

[Michael Collins]

On Wed, Oct 21, 2009 at 3:51 PM, Mark Campbell-Smith <
mcampbellsmith at gmail.com> wrote:

> Thanks Guys for your suggestions!  Very much appreciated.
>
> The reason I asked was that I want to check if a variable is set or
> not.  I don't think your suggestions will work because I actually have
> to check to see an undefined variable.  Any way to do this?
>

Not in the dialplan itself. Better off using a script for this.

>
> I want to have the same extension for checking digits read from DTMF.
> The problem is that the digits are not set to the variable until the
> transfer statement, which means I would require 2 extensions.   It
> will make things simpler if I can have the same extension that reads
> the digits and then checks them.
>

You need either to use multiple extensions or use a script. The dialplan was
specifically designed not to be a programming language and the functionality
you seek is best served by using a script or by using transfer to drop the
call through the diaplan again and use another extension.
-MC


>
> For example:
>
>  <extension name="checkdigits">
>      <condition field="destination_number" expression="^checkdigits$"/>
>       <!--The next condition should be true if the variable $digits
> is not set/undefined -->
>        <condition field="${digits}" expression="^[^.+]$" />
> -----<<<< what should be here to check for undefined variable $digits
> ?
>           <action application="read" data="1 10 ivr/ivr-hello.wav
> digits 10000 #"/>
>           <action application="phrase" data="spell,${digits}"/>
>           <action application="transfer" data="checkdigits digits XML
> features"/>
>      </condition>
>
>      <condition field="${pincode}" expression="^${some_variable}$">
>             < SOME ACTIONS HERE >
>      </condition>
>  </extension>
>
>
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