PHP/Mysql website

Hi !! I am looking for a small team to develop a php/mysql website with [login to view URL] and Voip integration. I will share complete details with selected worker. It's a large scale project so please don't bid if you don't have expert level skills and have enough resources to complete this project. This is an important project for us so i will prefer worker who will agree to put atleast 20% of guarantee money and can show me past work with authentic references. Thanks, Techlancer