[asterisk-users] original & reformat extension

[Alex Balashov]

You could just store the initial value of ${EXTEN} in another channel 
variable before doing any postprocessing on it.  You can then refer to 
the original received DNIS whenever you like elsewhere.

Karl Fife wrote:

> Question:
> Naturally there are times when need to I reformat an extension in a 
> context as such:
>  
> ;Reformat add CC1
> exten => _NXXNXXXXXX,1,Goto(1${EXTEN},1)
>  
> -or-
> ;Reformat 011 with with +CC
> exten => _011X.     ,1,Goto(+${EXTEN:3},1)
>  
> It's a helpful trick, BUT there are times when I want to send the call 
> to another context in its original un-reformatted state.  Naturally the 
> ${EXTEN} variable has been changed.  It occurred to me to use 
> CALLERID(DNID) as such:
>  
> exten => _1NXXNXXXXXX,n(fail),Goto(other-context,${CALLERID(DNID)},1)
>  
> ...but I am wondering if I can be 100% confident that CALLERID(DNID) 
> will always be equal to the 'original' ${EXTEN} variable.  I observe 
> that they are the same, but it occurs to me that it may be up to the 
> convention of my ITSP(s) or PRI provider to populate that value equal to 
> the original ${EXTEN}, and therefore it may vary over time and between 
> providers.
>  
> If the answer is "NO, CALLERID(DNID) is not reliable and can vary 
> between providers and implementations", I then ask whether there is a 
> RELIABLE place from which to fetch that original EXTEN value without the 
> added dialplan overhead of saving it myself
>  
> Thanks!
>  
> -Karl
>  
> 
> 
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-- 
Alex Balashov
Evariste Systems
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