https://smith.ai/blog/28-business-voicemail-greetings-for-main-office-and-personal-numbers-formal-informal-modern-and-just-hilarious
One of the most challenging aspects of writing for speech is optimising text to be read aloud and recorded. On paper, long, complex sentences are easily accommodated. When read out aloud, the same sentences can sound awkward and confusing.

The transcribed text is expected to be approximately 85% accurate, which means eight (8) words out of every ten (10) should be translated correctly. Since the voice mail transcription is done by an automated program, accuracy depends on several factors, including the caller’s accent and noise levels during the message recording. Names and nouns may not translate accurately. To ensure the receipt of a message, a copy of the .wav file “audio” is sent along with the text transcription. English and Spanish. Other languages will result in an error message, but voice mail will be attached in the email notification. In the email version, you will see ellipses (three periods) after the last successfully translated word if the next word or words cannot be translated successfully. You may also see question marks next to words that the transcription did not understand. To ensure receipt of a message, a copy of the .wav file “audio” will be sent along with the text transcription. How do I know who called if the system incorrectly transcribes the caller’s name? You can still listen to the audio version attached to the email message, or just listen to voice mail over the phone. If I delete the email containing the audio file, will that delete the voice mail on my phone?
4.) Уважаемый Абонент, вы набрали номер совместной практики xxx. В настоящее время все наши линии заняты. Пожалуйста, подождите. Вы будете подключены к следующему доступному ассистенту как можно скорее.