The second example lets the caller know that there will be a delayed response time. This keeps the caller from thinking you're negligent in returning his or her call.
Want some sample business voicemail messages? Below are 21 pre-recorded business voicemail greeting examples to get you started. You’ll find voicemail examples for your business’s main phone number, your direct business line, your after-hours (or non-business hours) voicemail, some holiday-specific greetings, and your customer service line. Even better, all these voicemail greetings are free and you can download the voicemail’s mp3 file!

Think through what you are going to say before you place the call. When men hear the beep, they often freeze up and forget what they wanted to say. If you want to be the go-to guy at work, then you have to exhibit competence on all levels. Don’t spoil your confident image by hemming and hawing and filling your messages with “uhhhhs,” and “ummmms.” If it’s a really important call, consider writing out what you want to say beforehand. If the person picks up, great, you now have some notes to remember what you wanted to talk about. If they don’t answer, you can leave a clear and concise message.
Your callers should get a different phone prompt greeting when they call outside of business hours. This will let them know that you are closed, when you’re open again and give them some options to act upon now, so they don’t feel like they’re totally wasting their time. For example, you can send them to your website where they can find information they’re looking for or allow them to leave a voicemail message to someone specific within the company.