Ringless Voice mail drop

Dear all,
do you know anyone that can set up a RINGLESS VOICEMAIL DROP system for my company ?

Had to google Ringless voicemail drop, but the information I can find talks about having access to the voicemail server to place the recordings directly into the voicemailfolder…

So, I dont think it has anything to do with Asterisk… But I might be wrong, if so would like to be educated… Not on how to achieve this but how to block it…

This is not possible using Asterisk, asterisk just can dial an specific number but it is the receiving party who decide if send the call to the voicemail or some place else