Group Supervision - How to set up?

[adn77_DUP]

Hello everybody,

I am setting up an OmniPCX M (1G) with 4029 Handsets.
The Siemens Hicom we used before, is able to (silently) indicate a call on all sets in a Hunt Group. This is what I am trying to do with a "group supervision" softkey on the 4029.
1.) 10 sets are members of the same hunt group (*50, "cyclic")
2.) "Group called with signalisation mode" is checked (under "System Miscellaneous -> Feature Design")
3.) each set has a "group supervision" softkey pointing at group "*50"

Calling the group (internally or externally) yields the normal cyclic distribution, yet no indication of the call on any of the other member's sets.

What am I missing here? Any hints are greatly appreciated!!!

Regards,
Alex