Do you simply want to create a winning impression, be aware of the effect your voice and your words have on others. Remember:

Use body language.  When you are animated, you sound animated.  Create excitement and interest in your message.  Use your hands, even when you’re on the phone.  Hands-free headsets are great to use.  Plus, you get some exercise moving (not sitting) while you’re talking on the telephone.

Smile. Did you know you can hear a smile?  Try it.  The next time you’re making a call, smile while you’re talking.  The person on the other end of the line can’t help but catch the feeling.  A smile is contagious.

Being aware that you’re words, your enunciation, your presentation and your tone will create another winning first impression for you!