i am getting a lot of interference on my BT line. i can hear crackling as soon as i pick up the receiver. this is not a problem at BT's end as i removed the front panel from the main line box and plugged in a phone and it sounds crystal clear. i have 4 extensions from the line box, all have crackling on them, i have checked and all are wired correctly.
this crackling is also causing problems with my broadband, i lose the connection intermittently and have now noticed the only way to get the connection back is if i make or receive a phone call.

please can anyone help, this has been doing my head in for 4 months now.

thanks for any help.