Question: Ringless Voicemail Drops

Hi guys, Wondering if anyone has knowledge with ringless voicemail drops.

My Situation: A competitor of mine has it set to when you sign-up for a free report on his website, you get sent a pre-recorded "phone call" that goes straight into your phone's voicemail. This message was sent the second we finalized our contact info which makes me believe that right after his system gets the phone number from sign up, it auto sends that pre-recorded message.

Does anyone know what this person could…

Question: Ringless Voicemail Drops