Sandman - Ring Voltage Booster II for Bridged Ringing - Increases Ring Current to 7.5 REN and Voltage to 90VAC RMS - True Sine Wave Output Makes Any Device with Analog Port Ring - Easy Installation

The phone rings nicely again

My old phones which are connected to a FritzBox are now ringing like they used to on analog landlines

It never worked! I bought it to boost the REN in order for my Western Elect ringer box to work/ring.It did nothing, I understand there are other units out there, RG10A Viking is one I my try at some point.

I have an Ooma which is connected to our house phone lines. Please note that the regular phone service to the house has been physically disconnected for several years. To celebrate setting up my new home office, I acquired a very nice classic 2500 desk phone. But the ring was very weak - I thought it might be defective. Then recently it occurred to me that it may simply not be getting the power it needs from the modern Ooma device. I bought this device half expecting it to not solve my problem... but lo and behold, once connected it gave a clear, loud bold ring as one would expect from one of these classic phones during the height of their reign over office desks everywhere. Please note the red LED on the device only lights while the phone is actually ringing, not when it is waiting for a call. I've only had the device one day, so who can say what tomorrow brings, but for today, I am a satisfied customer.

On your vonage phone line, dial *** then 02 when asked for a command. It will give you the ip address of the box. Go there on your browser and login with 123. On the status page, go to the run test page. Pick the REN test and run it. It will give the number. Max is 3. The ht801 does not produce enough ring voltage to run this item. Get rid of old phones with high REN values and get below 3 and your phone will ring without adding this product.

The media could not be loaded.  Have several old phones. Disconnected my house from land line going to the telephone pole. Hooked the ring booster to inside wall jack and plugged the output from the MagicJack to it. Rings several old analog phones. Nostalgic. Was testing this old phone out and had a friend call my MagicJack number.

It is a great product and works as it should, I am now using multiple antique phones and the ringer is perfect. It is a little pricey for what it does, but it does work 100%. Yes I would buy it again if needed.Worked fine with Vonage and any other product, is connected down stream of the adapter than the phones.