You need to be on a call to use this feature. Using this feature will transfer a call directly to a user’s voicemail box. Once on a call:
1. Dial *4 and wait for new dial-tone.
2. Dial the extension of the voicemail box you would like to send the caller to.
This feature is useful to use either when you know someone doesn’t want to be disturbed or you know someone isn’t around to answer their phone. Of course after 4-5 rings the caller will end up in the mailbox anyway. *4 directs them to the voicemail box without any rings.