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From: jimmy@denwa.info.com (Jim Gottlieb)
Newsgroups: comp.dcom.telecom
Subject: Re: Does *ANY* PBX Supply Loop Interrupt Signal??
Message-ID: <15237@accuvax.nwu.edu>
Date: 5 Dec 90 18:08:35 GMT
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In article <15081@accuvax.nwu.edu> is written:

>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.

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

Ahh, the subject over which I would love to hit some PBX designers
over the head.

In my searches, I came up with a few.  The NEC NEAX2400 has an
optional analog line card that does provide CPC.  Their normal one
doesn't, so you have to be sure to get the cards that do.  But I hate
the feature implementation and the sets that the switch uses along
with the fact that it will not let you send long touch-tones.

The AT&T switches all provide CPC.  They also allow long touch-tones.
Something that AT&T got right.  But their switches tend to be a bit on
the expensive side.  Prices in the used market aren't that bad though.

I am told that the ITT 3100 series also provides it.

And that's all I know.  Now wouldn't you think that a CO switch
manufacturer like Northern Telecom would know enough to have this
feature?  But then they screw it up in their CO switches too.