I'd like a 2-line phone on which I can use my Ooma line and Comcast line. Any suggestions?
Does the AT&T phone have it's own power supply or is it grabbing it's power from the phone lines? If the latter case is true, it belongs in a trash can.
Hum is usually caused by a ground loop.
I have two different 5.8 GHz Panasonic cordless phone systems, a two line and a four line that work fine with Ooma.
I also have three wired two line desk phones that also work well with Ooma. Hub is on line 1 and Telo is on line 2.
Any of the DECT 6 cordless phones should work.
Telo with 2 Handsets, a Linx, and a Safety Phone
Telo2 with 2 Handsets and a Linx
The AT&T phone does have its own power supply. I've changed the AC outlet that I'm using, separated the Ooma from the phone, and basically done everything I can to change and/or reconfigure the setup, without eliminating the hum. I think it's just a problem with this phone. I've hooked up my Ooma to other phones without a problem.
I've had success with Panasonic phones in the past, so your suggestion is a good one. Thanks for your response!