AT&T MERLIN LEGEND Release 4.0 Feature Reference page 195

Feature Reference
Feature Interactions
Coverage
Forward/Follow Me
Transfer
Direct Voice Mail overrides Coverage-inhibiting features such as
Coverage Off, Coverage VMS Off, and Coverage Inside Off.
In Release 4.0, if Forwarding is active and Delayed Forwarding is not
set to 0 rings, pressing the Direct Voice Mail button at the forwarding
extension while a call is ringing on a button causes the call to go
directly to voice mail coverage and does not get forwarded.
In Release 3.0 and later, a call that is transferred to an extension using
Direct Voice Mail is not forwarded.
A user with a Direct Voice Mail button can activate Direct Voice Mail
after starting to transfer a call. While a transfer is being made, press the
Direct Voice Mail button to transfer the call to the extension's voice mail.
Complete the transfer as usual by pressing the Transfer button or
hanging up.
195
Direct Voice Mail