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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