I can do this project for you, the time i am offering is convenient for proper testing and adjustments required to be done on the site, please don't hesitate to contact me for further details, the quality of my work is out of the question, trust me. I just developed something very similar, for a call center, but it is in a private network and it was done using .net and SQL Server, so i feel more than confident to be able to do this under PHP and MySQL.