My position on this is that you need business quality phone lines to make business calls. Mobiles and dodgy skype connections just aren't good enough and are liable to go down mid-call/develop crackles/decide to echo through the ethos....
Is that really the impression you want to give? Also, how do you check the homeworkers are on brief with what they are saying? Or make sure they aren't breaking the data protection act? Or even how do you track what the responses were?
Too many variables on this one - you need to outsource it to someone who's used to doing this. It's one phone call, one invoice and you can get it done by the pros.
Of course, I'm completely impartial:
www.virtuallysorted.com/sales
But really the phone deal stats were driving me doolally....
C.