It makes no difference where you put it - and it is easier to renumber the extentions if you put it after the last, existing module - rather than someplace before the last module. However, if you originally numbered the voicemail extentions in a different range than the phones - you could shift the voicemail over a slot and put it in before the voicemail. You would have a little more renumbering to do - but not much. Either way - it makes no difference.
Tom Daugirdas,
President
STCG, Inc.
stcg.com