580 Matrix PRASAR UCS System Manual
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. PRASAR UCS allows you to set a maximum of 300 Auto Call Backs.
How it works
When you set Auto Call Back,
• The PRASAR UCS 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 can be configured.
• 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 PRASAR UCS 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 PRASAR UCS has the capacity to serve 300 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 canceled by the system. Also, the system will not serve any more requests if all the
300 requests are pending. In such a case, the system will play an error tone, when an extension
attempts to make a request.
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