When they are on a phone call, the other end experiences loud beeps every now and then, almost an electronic squelch type noise.
I have gone around their house and disconnected everything from the phone jacks that might interfer.
They are using a Netgear 834 router (version 1), and I have flashed it to the latest firmware, which increased their sync speed to 5.5MB, so they are getting a good download/ upload speed.
They are using a Linksys SPA2102 for handling the VOIP stuff, and have a uniden cordless phone attached to it.
I'm not sure were to proceed from here? can anyone suggest anything?
Thanks in advance.