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

[Daniel Pocock]

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.
>  
>
I think there is some variation on this idea where people use the SMS 
signalling to test mobile numbers to discover if they have been ported - 
but that may only be in the UK.

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