If you’re planning on doing a sales call sprint via phone – so, possibly via voicemail – trust the scripts crafted by close.io’s Steli Efti on this one . Finally, since it tends to come out of people nearly automatically whenever they leave VMs on phones: Please don’t say “I tried calling you” or “I wasn’t able to reach you.”
It is really important to strike a balance between coming off as too cold, conservative and impersonal with making your message too out there, long or eccentric. If you can create something memorable, it will help engage a caller, or potential client. Go too far off the deep end, and you’ll scare them away

In case you avoid answering phones at your desk, have a voice message ready. When recording such a message on the phone, keep it short, sweet, and to-the-point. If you are working at a place where direct interaction with clients is required, you might get pesky calls or bulk messages (e.g., orders, requests, contest-entries, etc.).
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.