Here are some links that may help. If you are still unsure (though it sounds like there shouldn't be a problem with your service), also included is a direct contact (email & phone) w/ an FTC person that will try to respond within 2 days I believe.
Telemarketing Sales Rule - 16 CFR Part 310
http://www.ftc.gov/bcp/conline/edcam...all/index.html
THis page ^ also has email and phone number CONTACT info for questions.
Do Not Call Registry Links and "hot link" to Q & A page.
http://www.ftc.gov/bcp/conline/edcam...all/index.html
Q&A for Telemarketers and Sellers About the Do Not Call Provisions of the FTCs Telemarketing Sales Rule
http://www.ftc.gov/bcp/conline/pubs/...dncbizalrt.htm