Research And Implementation Of The Relate Technology Of VOIP Client

This paper analyses the implementation of the VOCAL architecture and the OSIP stack. Based on the anlysis, we design my UA architecture and develop it in Windows platform. The UA has layered architecture, so it will be easy to develop further feature.During the design procedure, we design the concept of Call Service Process StateMachine.So it will save the times of adding new services.We concentrated on the implementation of RTP stack in the second part. The more important point of RTP stack is OOP and the Filter-Graph architecture. We use them in our design plan. They make our RTP stack more extensible. We are more easy to integrate Codec and implement the JitterBuffer method.We introduce the best effective Codec-iLBC in packet loss situation, and we integrate it in our RTP stack.As we know, NAT/FW is great threat for VOIP business. We concentrated on the solution of NAT Transerval. We analyses the five major solution of NAT Transerval and compare them.Based on conclusion of analysis and our business area, we design the solution of NAT Transerval and Fireware using TURN and Http Tunnel.