atcomsystems.ca/forum Forums TDM Business Telephone Systems NEC Telephones & Systems Tapping station lines on DTerm Series E

We are a call recording company, working in the call center industry. Our normal way of recording calls on the "station side" is to have the client do cross-connects that terminate in a cable with an amphenol that plugs into our recording boards.

We have a client with a NEAX 2400 and Dterm Series E digital phones.

The problem we're running into is this: The client tells us that when they tap the line with the cross-connect, the phone stops working.

This is a very strange effect, since the lines for the tap are not actually connected to any device. I'm assuming this has something to do with drawing the power off the line, but I don't really know.

Does anyone have any suggestions on how to tap the lines in this kind of system without interfering with the phones.

There is a special adaptor that goes into the phone but you still have to bring out an rca plug from the pins on the adaptor for the recorder. I think it may be called an aru adaptor fron nec. Its been alot of years since I used one. Does your voice mail allow live record?

Thanks for the reply. That's a lot different than our standard deployment, since our tap is usually in the phone room at the punchdown block. Coming off the phone adds a lot more wiring than we want to deal with.

I don't know what the client's voicemail does, but since we want to do 100% recording of all calls, I doubt that the VM system would be a solution.

Thanks for your help.

Does your logger have the ability to decode the digital signal between the phone sets & the PBX? We use a different voice logging system that can do this & we just loop the station cross-connect from the station port to the station cable & then to the logging system. The system we use can decode most manufacturer's signals.

Otherwise, you might have to have the PBX vendor install APR-U's on all the set's to get the analog voice path as Miteltech suggested. This will involve more wiring & hardware.

Digital Techniques, Inc. had been making their Expandable Digital-Analog Convertors. They work with Dterms. Each box can tap 12 Dterm lines at the cross-connect and provides recordable analog audio. Google it or check on ebay. They are also called EDAC.

I'm having trouble visualizing this:
"... we just loop the station cross-connect from the station port to the station cable & then to the logging system...."

Is that a station port on the phone? On the PBX? Sorry to be dense.

To answer your question, we do use Audiocodes/AI Logix cards which decode the digital signal, so that's not the problem. According to the client (and I haven't visited the site), it's the presence of the tap itself that is causing the phones not to function.

We have working installations on Avaya, Nortel, Siemens and other phone systems, so I assume this is some peculiarity of NEC.

Thanks for the tip on the DAC's. I'm familiar with these and they may be helpful.

I'm having trouble visualizing this:
"... we just loop the station cross-connect from the station port to the station cable & then to the logging system...."

The cross-connect starts at the PBX port, then loops thru the connection on the station cable, or the voice logger.

Do you have systems working with NEC already?

I suspect that their must an issue with the way your tech must be making these connections. Perhaps request of the customer to bring out their NEC vendor to assist?