Device for managing SIP message, system and method for NAT-Traversal

摘要

PURPOSE: An SIP message processing apparatus, an NAT-Traversal system and a method thereof are provided to realize more stable SIP message reception/origination and a media relay by transferring the media relay and the SIP message about all addresses of the originating terminal. CONSTITUTION: An interface unit(212) receives an SIP(Session Initiation Protocol) message from an originating terminal(110). The second interface part(214) originates the SIP message to a receiving terminal(310). A control unit(216) decides presence of the originating terminal of NAT(Network Address Translation) environment through analysis of the SIP message. In case the originating terminal is in the NAT environment, the third interface unit(218) transmits the first and second address about the originating terminal to a media relay unit(240) from a private network within the SIP message.