Leaving a voicemail can still be a good way to grab the attention of a potential new customer. However, when it comes to leaving a voicemail, you only have a few seconds to actually grab the listener's attention. Most salespeople screw this up by leaving too much information and making themselves sound like a salesperson, which is the kiss of death when leaving a voicemail.
Magic numbers for timing your voicemail in the industry average around 20 seconds per message.

13Please repeat the captcha below [utter captcha] to confirm you are not a robot before being allowed to leave a message at [your name]’s voicemail. This is a great copy of the internet’s way of cracking down on spam and robots. Callers will be left repeating the captcha unknowingly. If you are looking for ransom, I can tell you I don’t have money, but what I do have are a very particular set of skills. Skills I have acquired over a very long career. Skills that make me a nightmare for people like you. If you leave me a voicemail, then that’ll be the end of it. I will not look for you, I will not pursue you, but if you don’t, I will look for you, I will find you and I will call you. This is a classic line from the movie Taken (without the violence). Your callers will always get startled at the threat initially but will surely leave them in jitters as they drop a message in your voicemail. This is a classic trick and one that is both funny and frustrating. Watching people continue to speak as if you’re there is funny. Make sure they know when to leave a message though. You may also like 10 Great Templates: How to Say Thank You for Your Order to Customers
When you cannot answer your callers, the effect of a good voicemail and greeting is important. To create such a professional voicemail greeting, you need to pay attention to a few points. Here are some notes so you can create an effective business voicemail greeting.