Cold calls are a beating for the salesman and the potential customer.
Go for the low hanging fruit... existing customers.
Yes they are and its amazing how many companies don't utilize their preexisting base by going over and doing "courtesy calls" with their customers.
Here's a freebie and this cost other companies quite a bit of money from me, and even though its been a year, I'm STILL getting responses from my campaign.
"Hello there! This is ____ with ___. I noticed it's been a while since anybody has heard from you and I just wanted to touch base and make sure you're still taken care of. If there's anything I can do for you, Please give me a call. My number is ____. Thank you and have a great day!"