Yep,
I've got

DB25 ------------ULF
3 --------gnd----- 36
4------- 12v------17
5-- 12v switced---35
22-----ibus-------15

Removing the v50 box and putting in the ULF, greys out the telphone function and makes it unselectable ????????????

I'll try the 'reset' though, see if it helps.

Seems like somebody else on BMWland (UK) is having the same problem with the same vehicle.