Video call application for android

I want to create a video call application for android. It should be work like google video call/skype but users will be based on mobile numbers like whatsapp. The initial mile stone i will pay is 20 - 40%. There will be a preliminary test that you have to undergo to select for this project. Who provides the solution first for the demo that i given below will be awarded with initial milestone of $2000. After awarded i will send other details provided you have to sign the NDA agreement. And also you have to work on this same for the next update.(If it hit the market) The Demo/ Test/ Preliminary application is follows. 1. To-do: make an audio chat from java client in PC to android Server using udp protocol or any in java. I have uploaded some sample files for this(If you need this). Other programs of your own idea also encouraged. Remember. Who gives the solution for this first will be awarded. No other negotiation.