SIP-Based NAT Media Traversal Solution Design And Implementation

With the development of Internet and voice technology, VoIP has held a very large part of the communication market recently. It becomes one of the most popular topics in the areas of Tele-communication and Computer Network. SIP is considered as one of the most important protocols in VoIP and the core technology in NGN and 3G, because of its good flexibility, simpleness and extensibility.However, because ip address is limited, The development of Internet has been blocked.IETF introduces private network and NAT Traversal device, hoping to solve current problem.Meantime, NAT bring another problem, SIP application can not use in NAT environment.Therefore, many engineer introduce some NAT Traversal Solution, such as ALGs, Middlebox Contrl Protocol and STUN.These solution s can not be applied in different NAT network environmentThis paper introduce media proxy solution.Detaily describe its framework and workflow, describe how to implement media proxy and its modules...