asterisk users - Aug 2006 - Asterisk with BT's broadband voice service.

I've just signed up for BT's broadband voice service in the UK.  Running
a
packet trace on their soft phone shows it trying to connect to btsip.bt.com
using the BT account username / phone number.

I've tried replicating this in my sip.conf but get a 404 when it tries to
register.

Has anybody managed to get an asterisk box registered with BT?  If so,
how's it done?


-Ronan