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Purpose Setting up IPsec (IKE) Using SIP VPN to a home router (or NAT device), etc. SIP Proxy Remote Client Home Router Home Network INVITE Transaction (2) IKE (Media Session) (4) Tunnel Mode IPsec (3) Validate Fingerprint of Certificate Comedia-tls (RFC4572) for Self-Signed Certificate Auth ( a=fingerprint in SDP) |