I have a Telo that is connected both to the internet and landline (currently waiting for my number to be ported). I used to have ATT DSL and call quality was fine except for incoming calls. When people would call in there would be a series of evenly spaced buzzes that repeat a couple of times per second. I have since switched to cable internet but the problem hasn't cleared up. I have hooked up an old wired phone to my Telo and still get the same buzzing sounds so it is not something that is happening with my wireless telephone. Does anyone have any suggestions as to what could be causing this? I thought it was my DSL but that doesn't seem to be the case.
Common things that cause ground loops - your telo is connected to the phone line that is improperly grounded. Your fridge is putting a 60hz hum on the wire and is not shunting to ground properly or bad wiring or grounding, your coax for cable is causing a 2nd ground path to your internet or tv and that circuit has a ground loop.
I have had more luck using isolation transformers or moving my audio equipment to another circuit or ensuring my telephone and cable is properly grounded and not creating a 2nd path for a ground loop.
Jenson used to have lots of information on detecting the cause and ameliorating the problem with their GROUND LOOP KIT that you can buy.
Isolation transformers for power are made by several company. Richard Grey Power Company has expensive ones for audiophiles. Look for something cheaper if you can.