d. Utilizing Ambiguity Over Clarity: When setting up your voicemail greeting be direct and to the point. Tell callers your information, a brief greeting, and direction—i.e. “Hi, this is Jim Shamalam (from Iron Industries). Sorry I can’t take your call right now. Please leave your name number, and a brief message and I’ll get back to you as soon as possible. Thank you.” This is ideal, as you inform callers and let them know what they should do to ensure a return call. A lack of direction can lead to callers leaving incomplete messages (lacking contact or other information) or even callers hanging up without leaving a message altogether.
The first two are voicemails for prospects you haven’t spoken with yet, the next one is for when you’re calling a prospect or client back, and the last example is for when your prospect or client isn’t calling you back at all:

Voicemails need to maintain a professional consistency that’s aligned with the entity it’s representing. That said, the structure can vary depending on the situation. There’s no template set in stone. In fact, trite and generic should be off the table. The goal should be a balance of uniqueness and practicality.
10.) Olá e bem-vindo para John Doe. Por motivos técnicos, não podemos atender a sua chamada no momento. Obrigado por sua compreensão. Estamos trabalhando em uma solução. Se você quiser, você pode deixar uma mensagem em nosso site www.johndoe.de = Obrigado e até breve.