I must admit, I totally agree with Playfelt. I am one of those people who has little time during the day for phone calls, & prefers everything in writing (email) so I have that little reminder down the road of what has been discussed. I'm thinking your future client doesn't mean to be disrespectful. Perhaps, as Playfelt suggested, some up front things could be discussed via email, ending with the phone chat that is important to you. Good luck in filling your spots.