Advertisements I've had many emails and frustrating telephone conversations with Tiscali support on this. Unsurprisingly they tried to persuade me that the fault was with the Tivo, but I persisted. Today they suggested trying the prefix 1280. He wouldn't tell me what this does, but from my research, it tells Tiscali to route the call via BT rather than their telephony infrastructure. I think their intention was to prove that the problem was no different using BT. Anyway, it worked for me! May be worth a go.