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From: BRUCE@ccavax.camb.com (Barton F. Bruce)
Newsgroups: comp.dcom.telecom
Subject: Re: Does *ANY* PBX Supply Loop Interrupt Signal??
Message-ID: <15230@accuvax.nwu.edu>
Date: 4 Dec 90 07:28:39 GMT
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X-Telecom-Digest: Volume 10, Issue 866, Message 6 of 9

> Does any currently available PBX transmit the loop interrupt signal
> through to its POTS (2500-type) stations? Assume, for the sake of
> sanity, that the telephone company central office does provide a loop
> interrupt signal to us on POTS subscriber loops when the calling party
> releases the call.

PBX trunks should be ground start. Your switch WILL notice when the CO
hangs up their end of a G/S tk.

> According to our research so far, neither the Vodavi nor the Mitel
> SX-100/200 line provides this.

I have been told, but have never verified, that an SX-200D with
Generic 1003 can give the interrupt signal to the extension. It may be
possible with earlier generics, too, but the situation this came up in
had 1003 as an existing assumption. The person saying this was a Mitel
internal tech support type.