I was trained as an attorney but never went into practice. I have worked as a financial advisor which entailed a tremendous amount of cold calling at which I have become fairly proficient. I have also worked in the hospitality industry managing a hotel in central america which required a great deal of communication with non-english speakers.
As a stockbroker I learned to alter my dialect somewhat depending upon what part of the country I was soliciting. An affected slight drawl for southern parts of the nation, increased tempo for metropolitan areas, etc.
In law school I learned to project my voice sufficiently to be heard in a full courtroom or lecture hall.
I am conversant with all manner of financial and legal jargon.