SIP End-to-End Security with NAT-PT Traversal

X. Jiang and J.W. Atwood (Canada)


SIP, IP transition, NAT-PT, ALG, end-to-end security


SIP is an application layer control protocol for establishing media sessions. It carries the addresses in IP payloads, so a SIP-ALG is required for SIP sessions between IPv4 endpoints and IPv6 endpoints. However, as an intermediary entity in SIP system, SIP-ALG has to alter the SIP messages, which breaks the requirements of end-to-end security mechanisms. We describe an implementation of a SIP-ALG and a proposal for a SIP end-to-end security mechanism between the IPv4 public network and an IPv6 stub domain.

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