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

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


SIP, IP transition, NATPT, ALG, endtoend 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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