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Re: [isn-discuss] ISN dialing, numeric alternative to * key ?

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  • From: Kurt Zoglmann <>
  • To:
  • Subject: Re: [isn-discuss] ISN dialing, numeric alternative to * key ?
  • Date: Thu, 4 May 2006 12:06:25 -0500

I just recently joined the list, but I have read through this entire thread on the achieve at Let me preface this with the fact that I have never worked on older PBX equipment, so I do not readily know all the limitations. But I have an idea on how NOT to dial any extra digits and still effectively get the *.

First you have the older PBX immediately dial to an asterisk box after the user dials 012. Next the user pulse dials the subscriber and then waits 2x the normal expected timeout. Then after the timeout, asterisks beeps or indicates that it is ready to receive the ITAD.

Normally on a variable length number, users hit # to indicate to the switch to try and complete the call with the digits dialed. Otherwise, the user waits for the timeout and then the switch tries to complete the call. This is just an extension of that idea.

The only question that comes to mind is how are the pulses converted to DTMF for asterisk to consume? I don't know. Is there an off the shelf solution?

If you cannot readily find a solution to the pulse to DTMF conversion, you could modify the timeout idea to just hanging up. The user would dial 012-subscriber-number wait a moment for the PBX to send it to asterisk. Asterisk would beep. Then the user hangs up and calls the ITAD.

You would need to alter asterisk to store the subscriber number and use it in the second call. This stored value would also need a short life time and be linked to the calling number. The major down fall to this is what happens when the user makes a mistake and wants to hang up and try again. Do they have to wait 30 seconds for the expiration of the subscriber number?

Kurt Zoglmann
Kansas State University Telecom
109 E Stadium
Manhattan, KS 66506

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