110 PTSN default

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Lavarock7:
I hesitated posting this before, because the first comment was bound to be, "Yeah, but Obihai should have just left in the relay" and so on. I agree, but here is a fairly simple solution using a relay and a wall wart for those who don't mind hacking a solution.

This relay has screw terminals and an LED. It also works on AC or DC of various voltages so it should be easy to get a wall power supply to help. Then a couple of RJ11 jacks and a case. Not cheap but pretty easy to hook up. http://www.azatrax.com/track-power-relay.html

Without testing, looks like you would extend the phone line to also connect to 1NC and 2NC. The phone goes to 1C and 2C and the output (phone port) of the OBI goes to 1NO and 2NO. With no power, the phone connects to the NC terminals and the phone line. When power is applied, the phone connects to the output of the OBI.

The relay would be powered from the house power for automatic use, or with a battery or two and a manual switch for manual use. Of course, if you want to manually trigger the device, you could replace the relay with just a DPDT switch at a cheaper price.

ProfTech:
My Obi is old enough that it has the relay, however the idea of using a simple DPDT switch had not occurred to me. Great, simple idea! Could even be located remotely from the Obi if you wanted or needed to.

MurrayB:
The use of a splitter and an RJ-11 A/B switch like this one should do the trick:

http://www.amazon.com/Premium-RJ11-12-2-way-switch/dp/B000BSHG0S/ref=sr_1_1?ie=UTF8&qid=1351854794&sr=8-1&keywords=rj11+switch

Lavarock7:
Great idea MurrayB. I actually have one of those in the closet from years ago. In my case, I have the relay in the unit and no phone line for my 110 anyway.

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