[asterisk-dev] Libpri: get information about IE events on a channel

[Carlos Barros]

Hello list...

I always noticed that identifying/blocking collect calls in Asterisk is a
need that most companies have, and there's not a good solution for this (as
far as I know)...
Today I was searching once again about this subject and found something that
made me think..

I have an Asterisk server connected to a E1 ISDN, and I found a blog post
that shows that when u receive a collect call, you get an IE event that
tells libpri that the call
is a collect call:

*– Processing IE 74 (cs0, Reverse Charging Indication)

So, everytime a channel receives this IE, it's a collect call... so, is it
possible to, given a channel, extract IE informations in order to search for
this IE 74??
If so, I guess it's possible to build an asterisk app that will identify a
collect call, by doing something like this:

 * Get currenct span number;
 * Get current channel number;
 * Get struct pri from pris[span]->dchans[channel];
 * Search throught struct pri and try to find IE 74
 * If found, we have a collect call...

I must admit that I have NO experience at all with libpri (and very very
small experience in asterisk internals), so I might be telling the biggest
stupid thing in the world, so if that's the case,
sorry... But if not, if what I say makes sense, anyone has any clue of how
this can be accomplished?? If it's not possible, I would make a feature
suggestion for next libpri releases, to
keep track of received IE (or maybe only this one), as I think LOT of people
are searching for a way to identify a collect call, in a dialplan level..

Thanks in advance

Carlos Barros*
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