Need a Mobile SIP dailer software similer like Fring

Dear Programmers, I Need a Mobile SIP dialer similar like FRING. It should contain same features like fring. Please check ([login to view URL]) for details feature description. This software should need following features- 1. User friendly interface 2. Easy installing procedure ( plug and play ) 3. Instant Messaging (integration with msn contacts, yahoo contacts, skype. ) Chat and call: MSN, Skye Yahoo, Fring , ICQ, Gmail 4. Facebook and twitter functionality [login to view URL] SIP dialer for OS Mobile: Symbian (ALL), iPhone & iPod, Windows, Android OS, (communication via either GPRS, EDGE, 3G or Wi-Fi connection), Voice & Video 6. Dialer supports G729, G.711, G723.1, iLBC codec for sending audio & video data. 7. Dialer should be able to run behind NAT or on private IP 8. Full source code must be provided with proper comments on the code. Please only take my bid if you have extensive experience with this kind of work. Highly recommend a group not only one perso