Hi we are group of software developers and would like to do this. We can develop the client and server using following technologies.
Language: C++, Java (will be decided after the specification review)
Frameworks: J2EE (java), Qt(C++), wxWidgets(C++)
Protocols: SIP, RTP, Or custom one if you have.
We request u to please send the complete specifications so that we can review. After that we will tell you the actual action plan, budget and timline of the complete development.
Thanks,
Amir