[asterisk-users] Pre-pending certain digits (like 9) to an outbound call number

[Mojo with Horan & Company, LLC]

Like this?

exten => _XNPANXXXXXX,1,Dial(Zap/g1/9${EXTEN}|20)

Notice it matches 18005551212 and it dials 918005551212. (The 9 before the ${EXTEN})

Moj



Joshua Kinard wrote:
> Hey all,
>
> Working slowly on getting the myriad number of parts to my fax system plan together, and one of the pieces I want to nail is how to go about, for the outbound context (fax-out) pre-pending a digit onto a number?  I.e., for all my testing right now, I've been dialing '91XXXXXXXXXX', as the asterisk server doing faxing junctions into my old Rolm CBX switch, and so I need the '9' digit to dial outside numbers.  However, for deployment, I'd like to save the users confusion and have the server automatically append that leading '9' digit.
>
> That possible by chance?  I assume it is, but off the top of my head, it didn't seem intuitive.  Below is the exten lines for my [fax-out] context, followed by some test exten lines that wound up failing:
>
> exten => _X.,1,Dial(Zap/g1/${EXTEN}|20)
> exten => _X.,n,Busy
> exten => _X.,n,Hangup
>
> ; Test appending 9?
> ;;exten => _9XNPANXXXXXX,1,Dial(Zap/g1/${EXTEN}|20)
> ;;exten => _9XNPANXXXXXX,n,Busy
> ;;exten => _9XNPANXXXXXX,n,Hangup
>
>
> I was trying to do some basic matching to the NANP formula to catch when someone accidentally mistypes a number, but that didn't match up and asterisk was complaining that no exten lines in the [fax-out] context were matching.
>
> Also, is it possible offhand to block the dialing of certain numbers in the same context?  I.e., just as a check, to block faxes to 900 numbers?  I believe my Rolm CBX will do this for me, as it's got a pretty extensive list of area codes and exchanges that are known to be sinister in nature pre-loaded (probably needs updating, though...), but I figured that if I could block it in asterisk, to do so.  Save the Rolm a wee bit of processing and all (it is old, and probably senile...)
>
> That, and I'd like to filter accidental '9911...' dials using this technique (which would dial 911 emergency, and that wouldn't be good, since I doubt faxes are a good method of calling in an emergency (unless they have a color fax and can discern that the red ink really isn't red ink...)).
>
> Thoughts anyone?  Thanks!,
>
> --Josh
>
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