“Gracias por llamar al escritorio de (ingrese su nombre) al (ingrese el nombre de su compañía). Estoy en una llamada o lejos de mi escritorio, pero si deja su nombre, número de teléfono y el motivo de la llamada, le devolveré la llamada lo antes posible. Gracias.”
Hello, you have reached the law offices of X. Unfortunately, I am attending to another client right now, but I will return your call as soon as I can. Please leave me your name, reason for calling, and your number so I can connect you with the right department. This is far more professional than the other examples given in this guide. Lawyers should always be formal, smooth, and confident. Nobody is calling to make friends. They’re calling to get the job done. That’s why your message should be all business.

A relatively unprofessional one — like mine, for instance — does the opposite: It encourages prospects, recruiters, and potential connections to run in the other direction.
If you’re going to be out of the office on holidays or vacations, make that known in your voicemail so customers don’t think they’re getting ignored. Nothing is more frustrating to a customer than when they can’t reach you and assume you’re ignoring them.