Dialing digit tones being heard during call

[onsetcomp]

IPO 412 v3.1 (56)

I'm receiving more and more complaints that people who are on a call are hearing the dialing tones like someone is pressing keys on their phone. The customer calling in doesn't hear them but our sales and customer service people are going crazy with the sudden LOUD tones.

The call waiting has been and is still turned off for everyone. This seems to of started last week when all of a sudden the lights on the 412 module connecting to the other units all went out. We powered it all off and everything restarted fine.

Any ideas?

Thanks

 

[kwing112000]

What type of lines. Ihave seen this on POTS lines before.

 

[onsetcomp]

We have 12 pots lines and a T1 for long distance.

 

[kwing112000]

Can you tell if it is on the POTS the T1 or Both?

 

[onsetcomp]

At this point I do not know which lines it is happening on.

 

[kwing112000]

I have seen it happen mostly on POTS lines and it has been the pairs coming in they seem to bleed together. I have also seem the cable between the D-mark and the IPO be the issue. If you are using 1 cable for 4 lines it can happen. I have not seen it happen on T1 but i am sure that someone here has.

 

[onsetcomp]

Is this something I can have the phone company providing the pots lines come in and test or just randomly start replacing cables?

 

[Ragnorak]

Based on the information this is almost certainly a phone company POTS line issue. The IPO sets are digital so they aren't sending DTMF tones over the internal cabling in a way that could give you cross talk. Theoretically, it could be a timing slips on the T1 but this is highly unlikely and you would be having other symptoms as well.

This is typically caused by water in the cable, split pairs (the POTS line somewhere in the phone company's cable isn't on the same twisted pair) or the sheath of the cable isn't grounded. The phone company has to fix this.

There are some meters out there that can test POTS lines. You need a silent battery and a 1004 hertz test number. You can test for loss, balance, power influence, etc. I have a Dynatel 965 but there are newer and cheaper one's out there. I think Tempo makes some good meters. You won't be able to fix it, but you will be able to prove that it is the phone company's problem.

 

[onsetcomp]

Well, unless the POTs lines are crossing the T1 it must be in my IPO 412.

I have watched a few of the calls in progress and they came in on the T1 line and the T1 vendor said the T1 is testing fine and there are no other call problems.

Are there any internal logs or tests I can run on the IPO 412 to help debug this?

 

[Ragnorak]

Make sure the system is grounded. It's a possile (though not probable cause) and it only takes 15 minutes to do.