I take it this is a first-time prospecting scenario where you’ve tried to reach them, had to leave a voicemail and now you are trying the 2nd attempt. Hopefully, you’re using a voicemail strategy that includes sending the proper email to the prospect after the first attempt.
By default, the telephone number is the one assigned to you by your organization, but it could also be a cell phone number or email address. In that case, voice mail would be played back through your email Inbox.

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!”
Uploading an Audio file Select By Uploading an Audio file. Give the file a name. Optional: Leave a note for yourself to tell what the file is for. Click the musical note and browse your computer to find the correct audio file, or drag and drop an audio file onto the screen. Click Save. Click Select on the audio file you would like to use. Click Save to update the changes.