How to Transfer a Call Directly to a User Voicemail?

When you are on the call, press the dual phone key ☏⇾☏ on the telephone, then dial *99, followed by the user voicemail extension number, and press the double phone key ☏⇾☏ again to complete the transfer to the user mailbox.

Sheet Cheat

☏⇾☏ *99 Ext 102 ☏⇾☏.

Note: The example sheet cheat is using extension #102 as a destination.