Say ‘Hello’ in tones that speak how pleased you are to have the person call.” Smile even on a call, it comes through in voice
Most times people don't want advice but a friendly, sympathetic listener to whom he could unburden himself. Be a good listener. Encourage others to talk about themselves.
Ask questions that other people will enjoy answering.
Story telling is the most underrated skills, Dramatize your ideas, become a great story teller and learn to keep people interested.