They call me all the time as well.  I picked up once and they are calling about a magazine subscription.

representing Medical Devices Magazine. (See below)
"verifying" information so they can send me a free trade magazine.
They, of course, wouldn't identify themselves & continued to prod for personal data, which I refused until they told me who they were & who they were representing.
The only thing they would tell me is they were going to send me a "Medical Devices" magazine. I intend to contact the publisher & inform them this type of marketing is going to cost them my business.

http://www.devicelink.com/staffbox.html#mag_contacts

Medical Device Link
Canon Communications LLC
11444 W. Olympic Blvd.
Los Angeles, CA 90064

Main Phone: 310/445-4200
Fax: 310/445-4299
Corporate Web Site: www.cancom.com 

http://www.cancom.com/

I receive calls from this number on a daily basis: I don't answer, because they never leave a message and I don't recognize the number.  Please make them stop!

Received calls from this number on my cell phone AND home phone ALL last week and ALL this week.

The calls come in EVERYDAY at the exact same time - 10:27AM CST
so I'm guessing it's an automated system.

Anytime I answer, I hear a humming/buzzing sound, then it hangs up.
There's never anyone there and no response.

I don't owe anyone anything, so I know it's not a bill collector.

If it's a magazine subscription renewal, I do all of mine directly through the company's website or through email, as I don't respond to solicitation phone calls. I also won't renew a magazine subscription if the company uses practices like this.

I've gotten to the point now that I don't even answer calls from this number anymore and have even assigned it a special ring tone so I know to ignore it.

Except for today. The call came in at 12:42PM CST. Strange.

I actually tried to answer it; Same thing. Line noise and no response.

I work at night, so these early morning calls have to stop now.

Finally had enough of it.
Went and filed a legitimate formal complaint with the FCC and WILL follow up with it is as well. I gave the FCC as much info as I could find about this company, their calling practices, locations, numbers, website address, etc.

Hopefully something will be done about it, and soon.

"Vertex Group" is showing on my callerid. I don't answer as I don't recognize the caller. My daughter picked up the phone once and they hung up on her. I did some internet searching and found this website  http://www.vertextelecom.com/contact_us.htm . Is this them?