Gordon Henderson presented the following explanation :[color=blue]
> Well, they have a PBX... but it's at the end of another bit of ADSL and
> porting the BT line into the VoIP platform isn't an option right now...
> (It will be, but not for several months yet)[/color]

Could still be done over the ADSL....I'll experiment at the weekend
with my Mother's SPA3102.

She can certainly do a 3-way call, The three parties being my Mum, a BT
caller & a Sipgate caller. What I'm not sure of is what happens if she
then hangs up....