Test your line current,anything over 35mA can cause your problem: if it is can they or will they lower it? And have you seen it cause phantom ringing on all the lines?

Adi: When you say SLT do you mean feeding an analog station into the CO port?

BT: I'm assuming British Telecom, I'm not sure what a DACS is though, so what should I ask AT&T over here?

Thanks for the replys all,

Mark