Don' let background noise do the talking for you. Ambient noise on your recording could be sending the wrong message to your clients. The sound of your kids arguing in the distance could be the sign of a distracting work environment. Clinking glasses and restaurant chatter may leave the impression that you don't take your work seriously. When you record your voicemail greeting choose a quiet spot free from interruption, so your message is the only thing callers hear. It's also good to avoid large, cavernous spaces where sound verberates.
You don’t need to say why you can’t answer or where you might be, you simply need to say your full name, that you are sorry you can’t come to the phone, and that you will get back to them as soon as you can.

“Thanks for calling the desk of (insert your name) at (insert your company name). I’m either on a call or away from my desk but if you leave your name, phone number, and the reason for calling, I’ll return your call as soon as possible. Thank You.”
20. Hi, you’ve reached [your name]’s phone. I’m busy making deals or rock climbing [replace with your personal hobbies], so leave your contact information and a brief message so I can call you back when I have a free moment.