Indeed, you can deliver a voicemail to a prospect without directly calling them. Simply utilize a ringless voicemail drop solution within your contact center. Typically, a sales agent would initiate an outbound marketing campaign to the prospect to send a voicemail in bulk. A prerecorded voice message will automatically delivered to the prospect's phone without ringing.
However, Ringless voicemail works differently and sends the voicemail into their voicemail box without calling or ringing their call