You’ll want to have your office hours in the voicemail so that cleaning customers know when they can connect with you. You don’t have to always be available during all of those times, it’s just the possibility you’ll actually pick up your phone or will be able to give them a call back during those hours. Adding in office hours makes your business sound much more professional. It’s the sign of a more established, well-run company to have business or office hours.
12.) Bienvenido/a a John Doe. Puede contactar con nosotros de lunes a viernes de 8:00h a 12:30h y de 13:00h a 16:30h. En estos momentos no podemos atenderle personalmente. Por favor, deje un mensaje con su nombre y número de teléfono y le devolveremos la llamada tan pronto como sea posible. Para casos urgentes puede contactarnos al teléfono 0821 91039- 1211. Muchas gracias.

Avoid background noise. Whether you have music playing in your office, or you’re sitting in a coffee shop, background noise can make it difficult for your customers to understand your greeting. Limit the noise around you when you leave your voicemail greeting.
I have a confession to make: I haven't recorded a new voicemail greeting in nearly a decade. Since then, I've (hopefully) become more articulate, poised, and self-assured. But hear my voicemail recording, and you'd think I was still new to the work world, a little unsure of myself — and probably not an authority.