No phone call is ever made directly to the targeted subscriber.
Only a landline to landline session, aka system to voicemail server, is established to drop the message.
The targeted subscriber is not billed for the call.
The phone does not ring and the network does not carry an active call.
The FCC defines voicemail services as an Enhanced Information Service.
The FCC has intentionally not regulated Enhanced Information Services.
When Used Responsibly Ringless Voicemail Drops Are Also 100% TCPA, FCC And CRTC Compliant.