Matrix ETERNITY NE, System Manual

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Matrix ETERNITY NE System Manual 337
Auto Call Back (ACB)
What's this?
If the extension number you have dialed is busy or is not responding, you may use the Auto Call Back feature,
instead of repeatedly dialing the number. Similarly, when you dial a code to access a trunk and the trunk is busy,
you may set Auto Call Back.
How it works
When you set Auto Call Back,
• the ETERNITY will queue your call attempt.
• As soon as both extensions, yours and the remote extension, are available, the system will ring first on
your extension for the duration of the Auto Call Back Ring Timer. This timer is set by default to 30 seconds
and is configurable.
• When you go OFF-Hook, the system will ring on the remote extension (provided it is also available at that
moment) for the duration of the Auto Call Back Ring Timer.
• When the remote extension user goes OFF-Hook, your call will get connected.
However, if the remote extension gets busy before the system can ring on it, the system will continue to try
again.
Auto Call Back set for a busy trunk works the same way. As soon as the busy trunk port you are trying to
access is available, the system will ring your extension. When you go OFF-Hook you will be connected to
the trunk port.
• Each extension of the ETERNITY can set only one Auto Call Back request at a time. If you set another
Auto Call Back request, before the first one has been served, the system will override the first request
and serve the second.
• The ETERNITY NE has the capacity to serve 50 Auto Call Back requests from its extensions at a time.
The service duration for each request is 60 minutes. Requests that are not served within 60 minutes
are automatically cancelled by the system. Also, the system will not serve any more requests if all the
50 requests are pending. In such a case, the system will play an error tone, when an extension
attempts to make a request.
Auto Call Back request set by you will be cleared by the system, if:
• it was successfully served, i.e. your extension was connected to the remote extension or the trunk you
were trying to reach.
• you do not answer the Auto Call Back ring, before the expiry of the Ring Timer, i.e. within 30 seconds
(default setting).
• the remote extension does not answer the Auto Call Back ring before the expiry of the Ring Timer.