asterisk users - Mar 2006 - Extracting info from the $EXTEN variable

Is there a way to access only certain positions in the $EXTEN variable?
I'd like to filter my international calls based on the destination country:

My dialplan looks like this (1XX0. is the international calling 
convention for Chile)

exten => _1XX0.,1,Dial(SIP/${EXTEN:4}@external_provider)

But, I'd like to, depending on the destination country (digits 5 and 
eventually 6 of EXTEN), route my calls for another provider, something like:

exten => _1XX0.,1,GotoIf(${EXTEN[5-6]} == certain_pattern)?2,3)
exten => _1XX0.,2,Dial(SIP/${EXTEN:4}@external_provider1)
exten => _1XX0.,3,Dial(SIP/${EXTEN:4}@external_provider2)

How can I do that? I was looking the documentation, but it only speaks 
of stripping digits from the extension, not to selecting a range.

Thanks a lot for your help.

-- 
Atly.
?lvaro Palma

you will have to do that in the gotoif statement, something like this:
exten => _X.,1,GotoIf($[${EXTEN:2:1}=1]?20)
exten => _X.,2,GotoIf($[${EXTEN:2:1}=2]?30)
exten => just add your own here
the above will got to priority 20 if the 3rd digit is a 1, and to 30
if the 3rd digit is a 2.

On 3/9/06, ?lvaro Palma <apalma@opschile.cl>
wrote:
> Is there a way to access only certain positions in the $EXTEN variable?
> I'd like to filter my international calls based on the destination
country:
>
> My dialplan looks like this (1XX0. is the international calling
> convention for Chile)
>
> exten => _1XX0.,1,Dial(SIP/${EXTEN:4}@external_provider)
>
> But, I'd like to, depending on the destination country (digits 5 and
> eventually 6 of EXTEN), route my calls for another provider, something
like:
>
> exten => _1XX0.,1,GotoIf(${EXTEN[5-6]} == certain_pattern)?2,3)
> exten => _1XX0.,2,Dial(SIP/${EXTEN:4}@external_provider1)
> exten => _1XX0.,3,Dial(SIP/${EXTEN:4}@external_provider2)
>
> How can I do that? I was looking the documentation, but it only speaks
> of stripping digits from the extension, not to selecting a range.
>
> Thanks a lot for your help.
>
> --
> Atly.
> ?lvaro Palma
>
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At 03:39 PM 03/09/2006, you wrote:
>you will have to do that in the gotoif statement, something like this:
>exten => _X.,1,GotoIf($[${EXTEN:2:1}=1]?20)
>exten => _X.,2,GotoIf($[${EXTEN:2:1}=2]?30)
Close, but it needs spaces around the equal signs, like:

exten => _X.,1,GotoIf($[${EXTEN:2:1} = 1]?20)
exten => _X.,2,GotoIf($[${EXTEN:2:1} = 2]?30)

Or if you want it to not crash if EXTEN is empty:

exten => _X.,1,GotoIf($["${EXTEN:2:1}" = "1"]?20)
exten => _X.,2,GotoIf($["${EXTEN:2:1}" = "2"]?30)

Ira 


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