Discussion List for Freenum/ITAD Subscriber Number (ISN) Project

[Kurt Zoglmann <>]

I just recently joined the list, but I have read through this entire  
thread on the achieve at internet2.edu. 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
(785)532-4505