MWI notification key using NuPoint

[PureChimpie]

We have just migrated to NuPoint for voicemail and can't seem to replicate the MWI notification key on IP sets?

Customer still wants the facility of group MWI on mult set keys.

Can't find anything in the help files to achieve this just using distribution groups which lamps on the IP set but really need it on a set key as before when using the embedded VM.

Any ideas?

Thanks