Have been getting these calls at various times for a month. Today I called them back and they said they were calling on behalf of small business network to verify our membership. I told them they had dialed a residential telephone and to please place my number on their do not call list. Fellow on the phone was very polite but I have little faith he can or will actually do anything about the calls. Calls are obviously generated by an auto dialer, hit or miss, and they have no idea who they are goign to be speaking with; also explains the deadline when I have answered this ID number.
This appears to be the telemarketing efforts of the Small Business Network out of California. While there is an opt put option when they call, the calls generally resume in 2-4 weeks after the opt out. I have also gone to their website (http://smallbiz.infopeople.org/misc/thankyou.html), selected 'Contact Us,' and requested to be taken off their call list.