My father in law has a sicko friend that does the following (if it's a female telemarketer....I guess it could work if it was a guy also):
guy: hello
tm: hi, may I speak to x
guy: this is him
tm: goes into her speil
guy: let's her go into her speil
guy: (after some time) my, you have a lovely voice, ever think about doing some work with it?
tm: why, thank you....no not really
guy: gosh, I can't get over how sexy your voice sounds. Listen, don't you even think about what I'm doing over here on this end....just continue talking please (moans).
tm: click
BTW, that Tom Mabe clip is a true classic! Cracks me up every time I listen.