simple way is not with a hunt group, that requires a hunt group pilot which it doesn't sound like you need..
set a
chg
2616
x x x x
echg yep
cls hta sfa fna
hunt xxxx (the dn of the next step)
fdn xxx the dn of your voice mail
then change the next phone, that would build a hunt group,,
if a is busy ring b, if b is busy ring c.. or if no one answers any station, go to mail.. you can fdn the same path, but fdn just forwards 3 times
john poole
bellsouth business
columbia,sc