[asterisk-dev] ISDN gurus - getting isdn call progress ??

[Steve Kennedy]

On Tue, Nov 14, 2006 at 04:35:49PM -0600, Kevin P. Fleming wrote:

> Julian Lyndon-Smith wrote:
> > we have an ISDN-30 Euro connection. When dialling out is it possible to
> > stop a call when it is about to start ringing ? (i.e is there an ISDN
> > message that says "yup, this is a valid number, starting to ring now" ?)
> The message tells you that the call has _begun_ ringing, not that the
> call is being placed. I don't know of any signaling that you could use
> just to verify that numbers are dialable, without actually placing the
> calls and then dropping them.

You should be able to do that at the ISDN signalling layer, or via SS7.


Steve

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