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

[Christian]

>
> IIRC, ACM maps directly to ISDN Proceeding, so that might be a way to 
> do it.  If you receive a proceeding message, you could consider it 
> valid.  Though I'm not absolutely sure that that would be a qualifier 
> for a valid number.
a proceeding is no must. The  alerting or even the connect message might 
come directly after trying to establish a call with a setup...

you can send a setup with a different Bearer capability then speech e.g. 
video or data, then the phone won't (typically) ring and you might  get 
a Setup Acknowledge or proceeding message.


>
> Matthew Fredrickson
>
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