For many businesses and professionals, your voicemail greeting is going to be the first point-of-contact for your customers. This is especially true for service businesses, who often rely on their voicemail to collect information from interested parties.
You could add the words "After-Hours Service" or "After-Hours Line" after the company's name. That way there's no concern over whether it is indeed a number that reaches a real person who will return their call during non-business hours. It's a way to let them know they're on the right track. If that makes sense. :)

For many small businesses, the announcement will send the caller straight to a voicemail box. But larger organizations may decide to direct callers to a phone menu or forward the call to an external destination, depending on the situation. These options can include: Listing individual voicemail boxes for different departments or employees. Forwarding calls to a professional answering service. Giving callers an option to connect to an after hours or emergency support line. Directing calls to a personal cell phone. Presenting menu options for additional recordings about office locations, ongoing promotions, and other information.
3.) Bem-vindo a John Doe. No momento não podemos atender a sua ligação ou você está nos ligando fora do horário comercial. Por favor, deixe uma mensagem com seu nome e número de telefone que vamos ligá-lo de volta o mais rápido possível. Obrigado e até breve.