Phone call from this number at 0921h this morning.  No message was left.

After hitting *67 (to block my CallerID), called back and I got a recording stating "You have reached the doctor's network.  If you wish to be placed on our 'Do Not Call' list, press 1."

At this point, I hung up.  I do not want to give my number to the telemarketer and hope that they never call me back.  It only confirms that I am a real person and they can call me on a different number.  Instead, I prefer to block the number from my end, which I have done.