This is rather a funny little problem.
Mate has a BT Hub with wireless phone attached to it. He also has a main phone just incase electric goes off. Hub and main phone are both plugged into ADSL filter.
He had problem with wireless phone and after much communication with BT, they changed it.
Since talking to BT, his wireless phone number is always engaged and any calls to it goto 1571. He can dial out on it though.
I phoned him on main phone yesterday but he was out. He phoned me in the evening using wireless phone and during the conversation I told him to check when I called by dialing 1471. He picked main phone up and we were able to chat without him doing anything.
Could it be the BT Hub has gone wrong again, or could it be the ADSL filter....?
Not keen on trying to discribe this fault to India !