"Smile when you are talking and put energy behind your words," says Charlene DeCesare, a veteran sales advisor and founder of Firewalk Sales School. "Even though they can’t see you, your emotion will come through. If you let it, the power of your voice will be far more effective than any written communication."
Please note that if you record an unavailable greeting, it will be used instead of the default message with your name recording.

Recording Your Greetings Press the Message key on your Grandstream phone or press * 97 from the phone Enter your password. In default, this your extension number, followed by the # key. Press 0 for Mailbox Options. You have the option of recording up to three greetings.
Increase the odds of getting a call back by mentally composing your message before each call. And remember, people hate it when callers state their name and phone number too quickly in voice mail messages – no one wants to listen to a message ten times to comprehend simple information. Begin by saying your name and company (if applicable). Then assume the person you’re calling doesn't have your number, so say your phone number twice. If your name is at all unusual, spell it the first time you say your phone number. Talk slowly like you were writing it down yourself. The second time you say your phone number, you can say it at your normal rate of speech. A gracious phone message is no longer than 30 – 45 seconds. Be pleasant, but also get right to the point. Keep your voice mail message to two points maximum. If you need to share more information, then say you will send an e-mail message with the rest of the details. Leave a specific message. There’s nothing more frustrating than a voice mail that says, “Hi, it’s me. Call when you can!” Even if you’re just calling to say “Hi”, tell them that in your message. End on a high note! You don’t necessarily need to say “Goodbye” at the end of a voice mail, because you didn’t really talk to anyone. Instead, try something like, “Look forward to talking* with you!”