CALL CENTER SOFTWARE - Asterisk and Zoiper

I need call center software designed, very similar to [login to view URL] READ FEATURES ON BOTTOM OF THAT PAGE. It will use Asterisk and Zoiper web softphone should be integrated into it, as I do not want to use X-Lite or another standalone software. I also prefer ExtJS UI, unless you have other options. YOU MUST EXPLAIN OR SHOW DEMOS OF YOUR ASTERISK SKILLS. ZOIPER EXPERIENCE IS A PLUS. I am attaching a file that includes screenshots of the application. Designed will be modified only slightly. PM me, and I will provide login details to our application so you can take a look around and see the functionality of it. DO NOT ASK FOR LOGIN DETAILS UNTIL YOU REVIEW THE SCREENSHOTS AND KNOW YOU ARE CAPABLE OF DOING THE WORK. Good luck :)