[asterisk-users] A method to determine PSTN Call Provider?

[Gordon Henderson]

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