i dont know about that program but there is a program called Call Firewall and it works great. It allows you to reject calls by numbers with certain area codes or just specific numbers in general. I also allows you to block private or unknown callers. You can find it here.
http://www.freewarepocketpc.net/ppc-download-call-firewall-v1-4.html
It is freeware. The phone will ring like a half ring or a half vibrate...but then he immediatley rejects the call to voicemail without you having to do a thing.