sundance-communications.com/forum Forums TDM Business Telephone Systems Nortel Telephones & Systems disco supervision

Pull one of the lines off the Nortel and connect you butt set at the dmarc, call in using your cell phone, answer with your butt set, after you answer hang up the cell phone. How long does it take before you get the fast busy? Do you here anything at all during this time? If its dead silence from the time you hang up the cell phone and get the fast busy your co is not sending the disconnect order. You will always hear the disconnect order from the co on a pots line if its being sent.

Correct. If you dont know what it sounds like, it more or less sounds like the remote end has tapped on the hook-flash. I bought a device from sandman.com that will actually measure the millisecs.

Im more or less interested in this topic cause i have a few with the same problem, down in mexico. Here I know telco is not sending DS, but what has always baffled me on this was why the older vmail units, Nam and startalk, did not have this problem. These were upgrades and nothing changed on the telco side. There must be something the older units had that the CP is not detecting, namely reorder tone, which is offered by mexican telco.

[This message has been edited by rustynails (edited August 12, 2005).]

Jack, you could try shortening the disconnect timer. I think you find it under hardware and the default is something like 460 milliseconds.

This has solved problems for me where an outbound transfer gets hung indefinitely.

In China,about line hunging up,i think it happens in this case that AA answers line and caller buzz off before don't dailing extension No.

Hi

I had/have this problem in Australia on pstn lines.
We have contacted Nortel who are looking into it.
It only happens with the global cartridges, I have used the old style B cartridge (australian issue distributed in around the mid 90's) these have worked fine here and the calls disconnect after either party hangs up (as it is supposed to work)
The older line carts work fine with the new software (I havent had any problems so far)
Hope that this can be of some help

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I have two scenarios where Disconnect supervision is not working. I have one telco using Adtran 616 channel bank to break the T1 to analog Loop start lines. The lines are then connected to Norstar KSU 6.1 cartridges. I have another telco who uses Digital subriber loop multiplexer at a remote location to break the T1 to analog voice lines. The POTS lines are connected to 6.1 Norstar. Both phone companies uses DMS switches, and COD is on both switches. We have replaced KSU at both locations. Is there anything in the Adtran that is not sending the disconnect signal to KSU, or is it the ksu loop start card not recognizing the disco signal. According to DMS engineer from Nortel, the DMS is sending the disco signal, then the Nortel KSU acknowledges it, send disco back, but at the same time goes off hook and draw dial tone from DMS. Very interesting.

Telephone company was able to resolve both problems. Telco made a dummy change to their FXO card in Central office. They programmed FXO card as Ground start, but the lines is still loop start. This helped Adtran unit to recognise the disco signal from CO, and this finally resolved my disco supervision problem.