Can I Turn Off Voicemail Or Transcription?
No. You cannot turn off the ability for subscribers to leave voicemails, nor can you turn off transcription.
However, you can directly instruct the user not to leave a message.
A more subtle approach is to leave five minutes of silence at the end of your recorded greeting. That way, subscribers will hang up before the greeting ends and won't leave messages. This has the added benefit of protecting you from robocalls because robocalls hang up after 30 seconds of silence.