Before we get into business voicemail greetings, here are some interesting facts about voicemail messages to think about. 75% of all business calls are not completed on the first attempt. 60% of all incoming calls are less important than the work they interrupt. 90% of all written messages contain incomplete information.
Doing this helps you understand what the prospects are looking for and what they are expecting from you which will in turn help you to cater to them better.

Keep a pen and paper next to you. Keep track of calls by writing down the person’s name, the time he or she called, and the reason. It’s best to write the information on a phone memo pad with carbon. This keeps the calls organized in one place, and when it isn’t for you, you can give a copy to the intended recipient.
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.