Design and implementation of selective RTP translator

RTP (Real-time Transport Protocol) is a protocol for multimedia transport and works over the Network layer protocol, such as Internet Protocol. Multimedia transport by RTP is restricted among the networks which are routed. RTP Translator translates multimedia data from one network to the other network which are not routed directly. Translator defined in RTP specification translates multimedia data by unit of transport address. The unit of transport address is very large and the transportation by smaller unit is better for many applications. And the rule of modification of header in specification of RTP is vague and the application must modify the header voluntarily when the translation is necessary between private and global network. In this paper, Selective RTP Translator is proposed for solving these problems. Selective RTP Translator translates by small unit with modifying media quality and defines the rule of modification of header clearly.