AbleComm Phone System Forum
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Re: Upgrade TA-624 to TA-824?
Transition should be painless. Free Windows software makes programming much easier than tapping buttons on a phone. Existing phones and wiring will be fine but accessory cards will not work. Caller ID is built-in for first three lines. Present door speakers will work.
If you don't presently have surge protection on AC and phone lines, get it. http://www.ablecomm.com/depakxprre.html