[asterisk-users] Stripping characters from ${CALLERID(num)} ?

[Steve Edwards]

On Thu, 7 Jul 2011, Tim Nelson wrote:

> On occasion, I have calls coming into an Asterisk 1.2.x system where the 
> ${CALLERID(num)} includes '-'. Ex:
>
> 123-456-7890
>
> How can I strip the dashes from the number, leaving me with 
> '1234567890'?

I would do this in an AGI written in C -- but that's just me...

At the start of most of my client's dialplans I do something like:

         exten = _!.,1,                  verbose(1,[${EXTEN}@${CONTEXT}])
         exten = _!.,n,                  set(ANI=${EXTEN})
         exten = _!.,n,                  agi(block-ani,--verbose)

The block-ani AGI does something like:

) Set the BLOCK channel variable to YES

) Read the ANI channel variable

) Strips leading '+'

) Strips leading '1'

) Strips anything non-numeric

) If the preceding steps changed anything, re-set the ANI channel variable

) Looks up the NPA to see if it should be blocked, return if true

) Looks up the NPA-NXX to see if it should be blocked, return if true

) Looks up the NPA-NXX-XXXX to see if it should be blocked, return if true

) Set the BLOCK channel variable to NO

) Return to the dialplan

-- 
Thanks in advance,
-------------------------------------------------------------------------
Steve Edwards       sedwards at sedwards.com      Voice: +1-760-468-3867 PST
Newline                                              Fax: +1-760-731-3000