OPT 81C Intermittent dialtone sounds like high pitch fax 3

[rj3738]

Opt 81c rls 4.5

Intermittent dialtone on 3904's and analog sets sounds like a fax on multiple phones in different network groups. Switch has been INI. The phones work just fine dialing in and out. Was plannibg on doing a reload. The switch consist of 3800 analog and 470 3904's.

Thanks

 

[rj3738]

Correction: The dialtone is NOT intermittent, the strange DT sound is.

 

[johnpoole]

does it always the same, per phone? could be a single dtr card.. i would do trac's to find a common card or speech path

john poole
bellsouth business
columbia,sc

 

[rj3738]

It doesn't happen on a call, just the dialtone from the switch when the phone goes off hook.

 

[DocVic]

I'll bet John is right. It's a DTR. Do some testing to trace the port and card, and order a new one. Every once in a while they do fail.

DocVic
Dedicated to Nortel Products till the end.
Need help? Call Me Now!

 

[rj3738]

It seems to be happening in different groups.

 

[telebub]

DTR is for analog. If it is happening to digital sets, I wouldn't be looking at DTRs.

 

[johnpoole]

tdtn.. tone digit switch and tn

 TN 056 0 14 14
KEY 0  MCR MARP ACTIVE  TN 056 0 14 14

ORIG   TN 056 0 14 14  KEY 0  MCR MARP  CUST 0  DN 4434  TYPE 3904
TERM  NONE
TDTN    62     SLOT    6   PTY SLOT  6

that's a trac to dial tone

john poole
bellsouth business
columbia,sc

 

[rj3738]

Thanks John, I'll do that.

 

[rj3738]

John, here is a trac of the dial tone that switches to a ringing sound in about 1 second. I narrowed it down to one DTR card (28-1-15). I swapped the card out with a good one and the problem stayed with the card SLOT (28-1-15) and not the card. Any suggestions? Thanks for your help.


.trac 0 64598

ACTIVE VGW TN 004 0 03 01
TN 004 0 03 01

ORIG TN 004 0 03 01 MARP CUST 0 DN 64598 L500
TERM NONE
TTR 028 1 15 03
DIAL 16 10 TTR 72
RCVR 74 SET 10

DIAL DN NONE
MAIN_PM READY
TALKSLOT NONE
EES_DATA:
NONE
QUEU DIAL
CALL ID 0 8890

 

[PERRYPJ]

your tone digit is the TTR

OLD ROLMEN WORKING ON NORTELS AND AVAYA

 

[rj3738]

Perry...I have 8 DTR cards in the switch and I used an analog test set on different TN's to grab dial tone from each of the DTR cards. The problem only occured when seizing tone from DTR 28-1-15 on all ports. Sometimes the same port would work and then the next time it gave the ringing type tone. Calls can be placed when seizing the off tone.

 

[rj3738]

DIAL 16 10 TTR 72

Should I replace the conf/tds card in slot 16? I replaced and moved DTR 28-1-15 with no luck.

 

[rj3738]

New Conf/TDS in slot 16 fixed problem.

Thanks

 

[Firebird Scrambler]

This problem that you have sounds to be very much the same as the one that is on a new CPPM release 6 system that has been recently installed. However, the difference is that we have virtual DTR / XTD's on the Media Gateways and the problem has been tricky to trace as we has a total of virtual 400 DTR / XTD's.

Once the problem has been raised by a user, we can't fault it for that extension!. They keep on saying it's like a high pitch Fax tone.

The other thing is that the incoming lines are fed via SIP. I'll try and keep you all posted.

All the best

Firebird Scrambler
Meridian Programmer in the UK

http://www.linkedin.com/in/davidbromley

If it's working, then leave it alone!.

 

[Firebird Scrambler]

The problem we had was traced to one of the customers 250 Cisco data switches, which wasn't configured correctly. We have incoming SIP trunks coming in via a (SBC) Session Board Controller.

All the best

Firebird Scrambler
Meridian Programmer in the UK

http://www.linkedin.com/in/davidbromley

If it's working, then leave it alone!.

 

[derbydave]

Firebird scrambler, in what way was the data switch not configured correctly?

We are having a similar problem with a newly installed rls 6 and upgraded opt.11s media gateways off the new CS1K.

An analogue extension will suddenly lose dialtone and instead just give a "beep" which is in fact the dtmf tone for the digit 3.

If you dial 401 for example after picking up the receiver and hearing the beep, the phone will dial extension 3401.

Outing the phone and rebuilding solves the problem for a while, then it returns.

The MGWC has been replaced, but no change.
In fact its happening to 2 media gateways on 2 different sites.

Any suggestions anyone?

Dave.

 

[Firebird Scrambler]

Hello Dave

Here is part of the problem that was raised last week below.

I just tried dialing your number and had the problem a couple of times. It seems like the call is being answered by a modem or fax machine, so maybe it’s being routed incorrectly somewhere along the way. Hopefully Fred can try dialing your number a few times and confirm that when they hear the fax / modem tones that the call either is or isn’t going across the SIP trunk. Maybe when it fails it’s not even being routed over it. If it is being routed over it is the CS1k sending it to the right extension? Just a few ideas?.

Even if it were possible for the CS1K to intermittently route the call differently (which sounds unlikely!) I don’t think the CS1K could be redirecting to a fax or modem because it doesn’t ring first – you dial and then immediately get the modem noise. If you call a fax or modem you always get a ring or two before the fax/modem picks up the call.

Here is the answer below.

The problem was due to a missing dial-peer on one of our Cisco 5400 media-gateways (we have 20+in routing at any given time).
I built a specific dial-peer for your traffic profile and added it to all routers for TDM-IP conversion, one gateways configuration did not take. I have now corrected this and checked all other routers to ensure the UAL dial-peer is in place.

The tones you were hearing was the DSP answering the call as it had no destination to route the call.

I can't give out the complete email for security reasons, but I do hope that this may point you in the right direction as the fault was located by the SIP trunking provider within their own network and it was nothing to do with the Nortel / Customer end.


All the best

Firebird Scrambler
Meridian Programmer in the UK

http://www.linkedin.com/in/davidbromley

If it's working, then leave it alone!.

 

[derbydave]

For info in case anyone else experiences this problem our fix was to make changes in LD56 - flexible tones and cadences.
I don't know exactly what was changed, but our support guy spoke with Nortel and they suggested various settings to change.