SIP 是一種在IP 網絡中建立、修改和終止多媒體會話的應用層控制協議，是下一代網絡的一個重要信令協議。當前的因特網主要是基于IPv4 的，IPv6 被設計來代替IPv4，但是在相當長一段時間內，兩者將共存。IPv4 與IPv6 終端間的互通顯得尤為重要。本文介
紹了IPv4 與IPv6 終端間的SIP 會話，同時對其會話的安全性做了討論，并針對其安全性提出了一種解決方案。
關鍵詞： SIP，NAT-PT，IPv4，IPv6，安全
Abstract: Session Initiation Protocol (SIP) is an application level control protocol that can
initiate, modify and terminate multimedia sessions. SIP is an important Signaling Protocol in the Next Generation Network. While current networks are still mostly based on IPv4, IPv6 is designed to replace the IPv4. However, that will be long time. So it’s important for the transition from IPv4 to IPv6. This paper describes the SIP sessions between IPv4 domain and IPv6 domain and presents a solution about SIP end-to-end security with NAT-PT traversal.
Keywords: SIP, NAT-PT, IPv4, IPv6, Security