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On the Security of Data Receiver behind a NAT Data Sender NAT/ FW Data Receiver Treat the signaling sessions (1) and (2) independently (authorization issue) Do not update state established on the NAT/FW (created by the proxy mode signaling session) based on an e2e signaling session. Proxy mode triggers a CREATE to deal with routing asymmetry and firewalls between the NAT/FW and the DR. (1) End-to-End Signaling (2) Proxy Mode Signaling |