asterisk users - Dec 2008 - A method to determine PSTN Call Provider?

I'm looking for a solution to determine if a PSTN call to a zaptel channel
was originated from a VoIP provider or not in real time.
I'd like to use the callerid(num) to reverse match to the provider.
Does anyone have a clue how I could do this?

TIA Bart
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With number portability?  I would think that would require a very large and
dynamic database that would get obsolete rather quickly.  I guess somewhere in
the deep innards of the network that database has to exist, but are mere mortals
allowed to access it?

Wilton
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Bart:

Please contact me off-list.  I seem to get a "security rejection" from
your mail server when I tried to e-mail you.

-- Alex

Barton Fisher wrote:
> I'm looking for a solution to determine if a PSTN call to a zaptel 
> channel was originated from a VoIP provider or not in real time.
> I'd like to use the callerid(num) to reverse match to the provider.
> Does anyone have a clue how I could do this?
>  
> TIA Bart
> 
> 
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-- 
Alex Balashov
Evariste Systems
Web    : http://www.evaristesys.com/
Tel    : (+1) (678) 954-0670
Direct : (+1) (678) 954-0671
Mobile : (+1) (678) 237-1775

On Sun, 21 Dec 2008, Barton Fisher wrote:
> I'm looking for a solution to determine if a PSTN call to a zaptel
channel was originated from a VoIP provider or not in real time.
> I'd like to use the callerid(num) to reverse match to the provider.
> Does anyone have a clue how I could do this?
What country are you in/want to tell?

In the UK it's realtively easy, but it's a big database, and it
won't tell
you anything about ported numbers eg. from a PSTN to VoIP operator)

That's assuming the caller doesn't withold...

Gordon