Anyone know any good conference/hotel booking software or website?

[isasir]

I'm looking for software that can help automate the task of booking rooms and class schedules for a yearly conference my company holds.

I would prefer it be actual software, as opposed to a website that handles the functionality but charges per registrant, but either will do.

http://www.register123.com looked good, but their toll free number doesn't work.

Thanks.