Asterisk + Website

I need a website coded using PHP/MySQL. Overall, users come to the site, set the time/date they need a call, and the asterisk box calls them. Calls are saved to Mysql and then a .call file will be generated. I have someone else doing the design and coding the design, so you will won't really need to do any design work. There will be user management needed, howerver, I have a php class I normally use that I can provide. I will provide more info after an NDA is signed and sent back to me, including an outline detailing it more specifically.