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Bps - In TELECOM Digest V23 #388, Kyler Laird wrote(in part): I'm trying to set up a home PBX and I decided to just take a crack at getting kewlstart/calling party control/disconnect supervision on my home line. I called Verizon and got bounced around until I hit someone "with 31 years of experience" who had never heard of such a thing. I was told that Verizon certainly doesn't offer it. I suspect that someone in Verizon knows how to provision the switch and can twiddle a few bits to give it to me. Is that reasonable? How do I find that person?I had not heard the term "kewlstart" before, so I did a quick Yahoo!search and reviewed what popped out.It appears that "kewlstart" is just a coined name for loop signalingwith disconnect supervision. Disconnect supervision is also called"calling party control", "forward disconnect", "open loop disconnect","open switch interval", "adjunct control", and perhaps othernames. What is supposed to happen is that the CO switch (or otherswitch serving as the office end) will remove battery voltage from theloop for about 250 ms within 6 seconds after the far-end partydisconnects.As far as I can tell, most CO switches now seem to provide disconnectsupervision by default on loop-start lines. Consequently, it can bedifficult to find someone at telco who knows anything about it.My company uses a store phone system configuration that requiresdisconnect supervision to work properly. Out of a few dozen storesper week with four to 10 lines each, I think we run into adisconnect supervision problem perhaps twice a month.As for availability on residential service, just check your currentloop-start line(s) with a voltmeter and see if it drops toward zerofor about 250 ms when the far end disconnects from the call. Ifthere's no disconnect supervision, you'll see the voltage stay atabout 7-8 VDC when off-hook, and about 48 VDC on-hook.On my residential service, I have three loop-start lines in hunt withdisconnect supervision. The telco is Verizon and the CO switch is a5ESS. The fact that it's residential service never was an issue ingetting the signaling and hunting I needed.Paul A Lee Sr Telecom Engineer Rite Aid Corporation HL-IS-COM (Telecomm) V: +1 717 730-835530 Hunter Lane, Camp Hill, PA 17011-2410 F: +1 717 975-3789P.O. Box 3165, Harrisburg, PA 17105-3165 W: +1 717 805-6208
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