Viking DLE-200B Two-Way Line Simulator

This is a powerful and deceptively simple gadget. If you connect an old-fashioned analog phone to each of its two ports, picking up one phone will cause the other to ring. If someone answers the other phone, you can talk back and forth. I used this to set up an intercom between the house and my workshop using the "second line" wires on the existing analog POTS wiring. This only took a few minutes to set up and works flawlessly.

I used this to make a telephone system between the helm and salon on a boat. Works perfectly. If either phone is picked up, then the other phone rings. The voice comes over loud and clear.

This is the coolest device. Arrived new, well packed and works right out of the box. No programming required. Just move some dip switches to change basic features like how soon the ringing starts. No dialing. Plug in two phones, lift one (off-hook) and the other rings. Very compact design.

Works great! Some customization too via switches as indicated in the user manual.

Old rotary phone compatible. Works great.

I don't know why you need to call yourself on your own phone at your own house, but my son got this and loves it. He is always playing with landline phones and knew what this was supposed to do and he had me buy it for him.

Not much to say, it just works. Used it for testing PPP dial-in at 33k6 baud. Comes with an sheet of instructions giving specifications, installation instructions (not needed in my case), DIP switch settings and explaining amusing applications for the device such as "prison phone" (intercomm) and "golf applications" such as allowing golfers to order food on the 9th and 18th holes! :-) Connections: two RJ11's. Maximum "loop length": 4.2 km (2.6 miles). Maximum current draw: 600 mA. Includes an AC adapter "wall wart" which puts out 13.8 VAC (yes, A/C) @ 1.25 amps. Is configured via an external 4-position DIP switch and an internal 5-position DIP switch. External DIP sets: Ring cadence (long-long, short-short-long, short-long-short, 2-seconds on/4 seconds off), audio volume, and answer mode (immediate ringdown or 2-seconds of dial-tone followed by ringdown mode). No external label of these functions so you'll want to keep the paper docs handy. Gave four stars rather five not for any defect but because it could be improved -- say, by having a clip to hold the folded instruction sheet (I used a rubber band) or by having a condensed set of instructions (DIP sw settings) printed on the device's case.

Perfect solution to create an in-house upstairs/downstairs intercom using two POTS phones and existing phone lines. The phones ring normally using the POTS ringer. The AC-DC adapter is included.