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How to sound professional on the phone
Write a brief sketch of your opening comments.
Nothing is more professional than someone who knows what they want to say and how to say it. If you know what you're going to say, the person you're speaking with will be put at ease and will sense that you are a true professional.
If you're making a sales call, script out your sales pitch. If you're in information technology, you can say something like: " i'm calling about the computer system you inquired about.