ISDN Progress Indicator

[awstewar]

A Call Progress message is receive and the Progress Indicator shows that the call is not end-to-end ISDN. More call information may be available in-band.

What should I do in this situatoin?
Should I connect the call?
How do I know what type of in-band signaling is being used?
Is there a way to specify that I do not support in-band signaling?

Thanks.

 

[TripleT]

In this case you should connect the call.

The Progress Indicator is most likely indicating that Tones are available inband for example Ring Tone.

 

[awstewar]

Do you mean I should connect the call with one way voice (receive only) like an alert message or I should move to the connect state?

Also, if I move to the connect state, how do I actually know when they have picked up the phone on the other end? This seems like it would mess up billing.

Will I receive a disconnect message in this case?

 

[GioBs]

Only receiving a connect message you can move to connect state.
The connect message will be received also when "the call is not end-to-end ISDN"
With the progress indicator "in band info available" you must connect for listen received tones and audio on b-channel.
In some situations it's convenient connect also in tx on b-channel (for example for sending dtmf to a toll-free service).
Moreover the "PROGRESS" message doesn't change the status of the call (instead "CALL PROCEEDING" do it and close the dialling phase)
Excuse me for my english
Bye

 

[ISDNman]

You can cut through audio before the call is "connected".

Basically in this case it allows the user to hear inband tones without returning answer supervision.

So the inbound *audio* is connected but not the call