Arguably the most intimidating factor when leaving a voice mail is the fact that once you leave the message, "in one take," there is no taking it back. That is why, especially in the business world, an overwhelming amount of people revert to email rather than leaving a voice mail message. Especially in a technologically advanced world, email or text messages are now used as a primary form of communication. Although there is a good argument behind opting for the written word over the spoken one, an email can lack the human touch, the emotion and enthusiasm in a voice, that can often times generate a better response. In fact, there is no impact that compares to delivering a clear, concise, professional message through your own unique human voice.
The trick is to stay on the line even if you’ve already recorded the message. Never make the mistake of hanging up, as you will never be able to save yourself! So what should you do?

If you are using a IP 400 series desk phone, press the Voicemail function key. If you are using a Cisco 7900 series desk phone, press the "Messages" button (envelope icon). If you are calling from a phone other than your own desk phone, dial your own phone number and press the * key when you hear the voicemail greeting.
Voicemail is an automatic answering service offered by your phone service provider. After you subscribe to this service, your phone service provider’s voice mail system answers calls for you when you are unavailable to answer the phone or when your line is busy. When a message is recorded a notification is displayed.