VOIP Connectivity to Multi Line Key Telephone Systems

Edwards Finance > Phones

Q. I have a multi-line key telephone system in my office. It is not VOIP compatible. Is there a way that I can use VOIP services from providers like Vonage for voice/fax? From what I see on Vonage's website, it seems to imply that their telephone adapter box will port out analog voice circuit(s) that I could connect to CO line ports on my KSU. From what I've read in this forum, the adapter provides two phone circuits, however, it can only handle one voice connection at a time. Does anyone have any experience in using Vonage or other VOIP service on a multi-line key telephone system?

A. I know that connecting a Cisco ATA186 to a key system works. I had to do it for one of my customers Emergency Ops Center. They had an old 1A2 system. The ATA provides battery and ring to the key system identical to what the CO does. They press a line button on the key set and the ATA goes off hook with no problem. One issue with this is lightning protection. Your KSU will isolate the incoming lines from its handset, and (one hopes) the other phone sets. It may not isolate one incoming line from another. Thus, if you get a lighting strike, you may burn out your VoIP TA (and possibly even more equipment down the (ethernet) line. So you probably should put some sort of external protection on the line. The 2500 series of sets were the same series of sets as 500 sets, but with 12-button keypads (including * and #) rather than rotary dials. There were also the 1500 series, which were the same as the 500 sets but with 10-button keypads. Just about any 500 series set ultimately also became available in 2500 sets, with the same buttons, features, etc. A set desginated simply as 2500 (not 25xx) would be a basic single line telephone just like a basic 500 set except with the Touch-Tone oscillator rather than the rotary dail. Other manufacturers besides W.E. used the same desginators.

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