Phobia of talking on the phone in front of co-workers. How can I overcome this fear/anxiety?

Question by blue skies: Phobia of talking on the phone in front of co-workers. How can I overcome this fear/anxiety?
Never before starting my present job did I ever fear communicating over the phone in front of others, so I think it partly has to do with a poor work environment that I suffer from such fear/anxiety in general, including when conversing over the phone.

I want to be able to not feel so on edge and uncomfortable on the phone, while at work. I end up stuttering and unable to

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