Wiki defines Cold calling as the process of approaching prospective customers or clients, typically via telephone, who were not expecting such an interaction. The word “cold” is used because the person receiving the call is not expecting a call or has not specifically asked to be contacted by a sales person.

I prefer saying that I make calls.  I don’t think of calls as having a temperature.  I think some of the responses I get are cold – actually some are frigid.   But me, I’m a warm person, and when I make my calls I try to be as polite and sincere as possible, and exude warmth.