The number belongs to Advanstar, tradeshow promotional company. Told them to remove my phone number from the auto dial list and not to harass me again or i would sue their [***]'s off. We shall see. Registering under the DO NOT CALL list is useless as they do nothing to eradicate these nuisance callers.
This is Advanstar. They call usually a month before the trade show to ask if I need the early registration passes. This is a great service as it saves me time otherwise have to wait in the long lines to get my show badge. next time they call, will answer.