I hate using DM tool but 2.4.2 is where to go.
Mmc 419 will also work from a keyset.I only use DM tool for Vmail programming and backing up the database.It's faster in my opinion toprogram from a keyset.
If you go into 419 enter the trunk number on the top line of the display and enter a ring tone for the trunk.You set this by trunk so you could have each trunk ring differently if you wanted.It comes in handy sometimes when there are say 2 different companies being answered by the same reception.