When using a Cisco phone, you can record and change your voicemail greeting directly on the phone. For the following instructions, to select an option, you can use the phone's blue toggle button to scroll down and highlight the desired option, and then press the Select soft key. Press the Services (globe icon) button on the phone.
Background noises can be picked up in voicemail recordings, and even though we may not want them to, they do subversively impact how our messages are received. Noisy backgrounds tend to trigger thoughts of a chaotic atmosphere --implying that you are disorganized or do not consider the content of your message to be important enough to be heard clearly. And if you don’t care about what you’re trying to say, why should the person on the other end of the phone?

iPhone users have another option: You can send a voice message from Apple's Messages by tapping the microphone button inside the text box (this works only when you're messaging other iPhones). By default, these voice messages last for only two minutes before they are deleted, but you can change that. Either tap Keep under any sent voice message or go to Settings > Messages and tap Expire under Audio Messages. You can set the expiration date to Never, but this affects only your record of the conversation, not the recipient's.
Conducting extra research on your prospects before you call them is always a good idea. This script from Mike Brooks is a great example of how you can use this additional information in your sales voicemails.