Just to clarify the correct way to configure this from all of the advise previously given.
User source numbers add H<GroupName> (Lights lamp & gives Visual Voice options)
Visual Voice does not allow recording fo group mailbox greeting (come on Avaya this is basic!)
To change greetings create a new short code as follows:
SC:<shortcode to access mailbox> / I Usualy use #<Group Number> but anything can be used
TN: ?"<GroupName>"
feature VoicemailCollect
To change greeting dial shortcode
Press 3 for greetings
select greeting (1 std, 2 Out Of Service, 3 Queue1, 4 Queue 2)
1 to listen to current greeting
2 Record new greeting (speak after the tone, press 2 when finished recording)
PRESS 3 TO SAVE (this is the bit that everyone forgets!).
A Maintenance contract is essential, not a Luxury.
Do things on the cheap & it will cost you dear