atcomsystems.ca/forum Forums TDM Business Telephone Systems Nortel Telephones & Systems MICS Disconnect

I have a customer who has a Nortel Mics 4.1XC. We are using T1 service for dentral office access on the system. Out of the MICS we are feeding 8 analog station ports into a Merlin Legend about a block away and have been doing so for many years.

The legend system went down in August and since that time the customer has been getting hundreds of times where their phone will ring and there will be just silence.
The Legend is being serviced by another provider and they say that they are not getting a clean disconnect and when the outside party disconnects their system doesn't see it and after a while the line rings the reception phone which annoy's the heck out of the receptionist.
Anyone have any ideas? I did not have a call for years until their system went down. Can it be something on our end?

well no. come on think about it. Their Merlin Legend system crashes and nothing changed on your end.

I would probably think the legend system either has an issue with
1) The CPU
2) The CO Card
3) The Power Supply

all of which in a crash might not come up as they had in the past. That's an old system that's been running for years and years, when they go down, sometimes they don't come back up the same.

All of these are cheap to replace, the parts are plentiful. I would replace all three pronto. It's cheaper than losing phone calls! and business.

well honestly the asm/ata doesnt supply disconnect supervision.SO how did they get it to work

Ok, think about this. If I'm at a phone in the Merlin, and hang up, THE CALL IS OVER, PERIOD, unless the call rings back from the Nortel for some reason. But, if I somehow am flashing the H/S...... So, I'm thinking that the other provider forgot to program the Merlin as being behind a PBX, OR did and shouldn't have?

Ghost calls are pretty common on the aging Legend and Partner equipment.

I guess another question is
1) does this occur on all phones, on all lines
OR
2) Does this occur on one phone, all lines
OR
3) Does this occur on all phoes, but only one line.

This thought process could lead you to a CO port, which i have seen produce ghost calls before on the Legend system

And further, luv raises a great point. When the legend went down did it just power down or did it lose all of it's programming and require starting over.

Are these 8 analog ports connected to the co ports on the legend? If they are go to their end and disconnect them, hook up your butt set and make some test calls from the nortel to your test set and see if you can duplicate the problem. If not, end of story it's the Legend vendors problem. In which case I would have them check their disconnect timers. They should be set at 600ms standard. If possible have them check their co length as well. If it is only 2 blocks away they should be set to short if they are set to medium or long then that can cause an echo effect causing the ring back.

I agree nothing changed on our system and it has been installed for 9-10 years. The analog ports are connected to the C.O. Ports of the Legend. The issue happens on all lines that are fed from the MICS and it happens often. I did have my test set on the station port and made a test call into the Legend-it was anwered by AA and I hung up, their greeting continued to play until it timed out and automatically transferred the call to the receptionist. She answered and received dead air.
I heard a rumor that a newer release of SW(We are at 4.1XC) may provide some type of disconnect whether it is dial tone or a busy signal or something. Anyone heard of this?

I fail to understand why you persist in making this your problem. The issue is on the other end based on everything you've provided! Get all the principals together and if the "other site vendor" can't or won't acknowledge they lack the knowledge, skills and abilities then bring in someone new. Being proactive here will not hurt your cause!

One thing you can do to PROVE it is not the fault of the Norstar is to put a Viking CPC-1 disconnect box on their first line, or multiples but they do cost some money.

That provides a positive disconnect and I use it on my VOIP boxes (my old Verizon numbers are in another city) to get my Toshiba voicemail to hang up after some seconds of silence or whatever I set it for years ago.

Up to you, but if you want to go to the trouble to prove it is the Merlin problem, the Viking box will do the trick.

Isn't it great that we have someone in the US hiring people to make things in the US? A toast to Viking.....................

You have to Enable LS Disconnect in the Legend.