I have a Comdial DX120 installed with a full PRI.
The DX120 is running software version F20 and the PRI chip is GO5.
When a DID is called from a land line or cell phone the call just sits there in silence. You will never be connected, hear a ring, a busy, or reorder tone. I have stayed on the line as long as 5 minutes and did not ever hear anything,
This happens about every 25 calls, not all calls.
It can be duplicated.

This happens when a CSU is being used or just a direct connection to the DX120 which does not need one.

I have set up a telephone to have all 23 channels appear on buttons and when the dead air call happens I do not see a line appearance like a normal call. The carrier tested with me to each individual channel and was able to duplicate the problem. They said by setting up a D-channel trap they see the dead air call being acknowledged by the CPE equipment but there is not a line appearance or even a quick blink to let me know there is a call.
The carrier says it is not their problem.

PRI card and KSU have been changed out.

Please help,

Mike

I have a customer that called me on Thursday with the same problem. DX-120, dual cab, PRI and I was abble to dup the problem. Getting ready to open a ticket with Vertical. Anyone have any ideas? You know what Vertical's gonna say, COLD START THE SYSTEM.....

First of all, if this is a PRI coming right from the smart jack or NIU, then the CSU is required, no question. That being said, since you were able to duplicate the problem with and without the CSU, that is really secondary (but still important, especially once you get Vertical involved).

Have you gone thru and double-checked all items in C.O. Line Application? That's probably where Vertical will start, by verifying correct programming in there. Also, verify you're not using Answering Position if using D.I.D.

Please keep us posted, but keep in mind that if it gets too technical, we'll probably have to move this thread into the Installer forum.

Justin

Precise, what cabinet software and what firmware on the PRI?

Thanks for information on CSU's?
Mike,
Thanks for getting back with me the other day. I will be going out to my site on Thursday. I have worked with Vert over the phone for about an hour and the ticket is still open. On Thursday 2-21-08 we will find out what the issue is and I will get back with you. 10 to 1, bad PRI card. They say if I program keys for all channels and they do not light upon incoming calls, its a telco problem. Your telco says its a D channel problem. Vert says if its a D channel problem then all calls will drop. Sometimes I think a higher power does not want me sitting at my desk playing party poker all day.
Jim

Since this was originally telecomtech1's thread, I'll go back to the original post first: any update on this?

Now, on to the tag-along Jim, any update on progress?

Thanks!

Justin

This morning the new loop and circuit was cutover by AT&T/Verizon for the T1/PRI with the dead air issues.

I set up a phone with appearance for all 23 channels
and Verizon tested good to all of them. We then proceeded to call in about 15 calls near the same time and did not have any failure.

5 years and counting: I did ask Verizon if they could emulate a 5ESS setting and they would check into it.(They are using NI2 Northern Telecom DMS 100)

I did put some ferrite cores on my KSU cables.

I will keep you updated as a few days pass for real live customer testing.

Mike

This is whats going on here. I got on site today for the first time due to ice storm that came in on Thursday and Friday. After programing all 23 trunks on line keys I was able to dup the problem about every tenth call with no light on the incoming trunk. I was able to press trunk 1 and answer myself even though it did not ring or light up. Worked with Vertical tech suport and we are going to upgrade the switch from F19 to F20, the PRI firmware from F05 to G05 and add the dx-80 hex file to the voice mail. All file have been downloaded and once the firmware gets here I will find out if this is the fix. I have been in direct contact with Mike and it sounds like his troubles are gone. NuVox is our local on this project and they say its not them and they have done a ton of testing. I will get back after the upgrades that will take place next week.

Here is the latest update on the dead air issue with the Comdial DX120.

The T1/PRI circuit has been replaced with a new loop from AT&T, a new smart jack and new cable pairs. Verizon has also replaced their circuit.

This was all cutover on Sunday and 2 days later I still have the same problem today.

The customer is talking about getting another telephone system if I do not have a solution.

I will be contacting Vertical/Comdial 1st thing tommorrow morning about the same problem again.
Wish me luck!

The following is pasted from an email from the carrier:

Good Afternoon Mike,

I received your report callers are getting the same dead-air issues. Everything is new on the network side so the only common denominator is your internal wiring and equipment. VerizonBusiness is willing to pull D-channel captures on completed and failed calls for your hardware provider to compare. VZB also recommends you set up default routing in your switch so any unrecognizable digits will still complete.


________________________________
The following e-mail for this Ticket was received on 2/26/2008 3:27:02 PM
verizonbusiness.com)


Everything is new on our side. We can pull two D-channel captures and email them to you if you can reproduce the dead-air.
--------------------------
Verizon Business
Local Voice/Voip MGR

Any response is appreciated as I see one other tech is having the same problem in another state.

Thank you,
Mike

My software and firmware upgrade is taking place Friday 3-7-08. I will keep Mike posted if this resolves my issues. It was my understanding Mike was going to have a conf call with the telco and vertical, but I have not heard from him in a couple days.

:bang:
OK.
Upgraded the software to f20, upgraded the firmware to G05, cold started, reinstalled the data base, upgraded the voice mail hex file and we still have the problem. 3 hours of my time on a Friday night!!!!! Vertical is sending me a new PRI card on Monday. I have a feeling this is going to be an issue of the Telco's switch settings. They have done a ton of testing and say its is not on the Telco's end.

I will get back to you when the new PRI card gets installed this week.

Any ideas? anyone?

All of my PRI equipped DX-120 systems are behind a #5ESS. I've never had a problem with any software or firmware release on any system. All systems have the circuit provided by a local CLEC called Everest Communications using an Adtran for fractional PRI.

I would be very interested to hear from installers that are having problems which C.O. switch is providing the circuit.

Maybe we can see a correlation between C.O. switch types and the various issues TECOM's PRI implementation has.

Reading the number of posts in this forum concerning this issue is making me very wary of proposing any PRI unless the provider is using a #5. Maybe some C.O. technicians could give us some input on this. I'm just a little disturbed that I'm having no trouble with firmware FO1, SW F15, yet so many posters are having trouble no matter what versions they are running.

--Bill.

F20 and G05 are the only ones that worked for me. Started with F19 and G05. No go. Upgraded to F20 no problems in 3 months.

This is what's bothering me. If I've had no trouble with the first release on the #5 and you had trouble until you upgraded to F20, G05, then what's the difference between my installs with Everest and your installs?

I have a couple of dozen PRI installs on all releases. I'm trying to find the difference so we can tell LECS what to program or provide. If F15, F01 works perfectly with a #5, which I consider the gold standard, than is it possible to correctly provision other switches to emulate the #5 in all respects?

If you know anyone at Everest to give you the circuit specs then get them. I've installed them on XO with Integrated Access Devices. I'll call them and see if we can compare 5ESS build notes and look for similarities/differences.

If I remember I'll give them a call tomorrow. I wonder if the configuration of the Adtrans they are using has something to do with it also?

Thanks
any help I could get from anyone would be wonderful.

I spoke with Telecomtech1 on Sunday. He took a Tadaran pbx to his site and the problem could not be duplicated. When I first installed my customer about a year ago we had a T-1 in it and problems. Vertical said to have the switch settings changed to dms100 or something because it would work better. Then we swapped out to a PRI. I can not find anything from Vertical about what switch to use. Last Friday night they said they are going to send me a PRI card and as of Wed I have yet to see it. I will call on Thurs to find out that ball got dropped.

Last Sunday we tested our PRI with a Tadiran PBX
and a Vertical/Comdial FXII. We made about 200 calls and and did not receive any dead air calls on either switch.

We then switched the PRI back to DX120 and after about 15 calls got a dead air call. We kept testing and had dead air calls between every 10 - 20 calls.

Currently working with Comdial engineering.

Update, The problem is gone. Today the Telco changed the settings to 5ESS and I just bounced 100 calls into the DX-120 with no problems. I want to thank everyone for the great information that someone should pass along to Vertical. By the way, I'm still waiting on that PRI card.
Thanks again.

Jim, thanks for the update. Maybe this is why I've never had any problems since all of my installs are with the same CLEC on a #5.

In NASCAR there is a term (cautions breed cautions) Now caller ID only shows number. Does 5ESS not show name and number? I have never had so many issues with PRI's or T-1'S until this dx-120 came into my life.

The 5ESS definitely delivers name and number, long before some other CO switches had this capability. It's not the 5E, it's the DX120. PRI signaling parameters in the United States all follow the same set of standards as mandated by the FCC, regardless of the brand of CO switch that provides the service. Many of the newer switches, better known as "soft switches" don't seem to follow this same standard for some reason.

You may want to check with the CLEC and make sure that they aren't emulating 5ESS custom instead of NI2. That's been known to give us a few headaches, but from what I've seen, that's about it.

The new circuit may be programmed to deliver number only. Check with the provider.

The telco says they are sending number and name, so why would it work on the previous settings (DMS100 I think) prior to 5ESS and the DX-120 does not have any settings that could be adjusted unlike the Inter-tel Axxess? The telco said they are sending the entire stream but only the number shows. The DX has setting for start and stop digits but that would not apply to this or would it?

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