主页（http://www.pttcn.net）：SIP 相关技术系列讲座开讲(6) Response Identity – A Problem! Rogue SIP Proxy Phishing and SIP exploit More Examples RFC 4475 Try for yourself with ‘example’ software tools NIST Recommendations NIST Recommendations on securing VoIP Part 6：防火墙，NAT 和SBC Overview Issues to address Firewalls What does a Firewall do? Are Firewalls effective? NAT or Network Address Translation What is NAT? NAT Request NAT Response UDP Hole punching Hairpinning Multiple NATs The NAT Problem Types of NAT Types of NAT NAT – Full Cone NAT – Restricted Cone NAT – Port Restricted Cone NAT – Symmetric The NAPT or (PAT) Problem Problems with NAT, Firewalls and SIP 解决办法 STUN (Session Traversal Utilities for NAT) STUN and rport Problems with ‘Classic’ STUN TURN (Traversal Using Relays around NAT) STUN RFC 5389 Interactive Connectivity Establishment (ICE) ICE ‘In Theory’ Candidate information and other ‘ICE stuff’. ICE ‘In practice’ ICE tags ICE-Lite and Trickle-ICE ICE Client settings More on ICE Universal Plug and Play (UPnP) ‘Near end’ NAT ‘Far end’ NAT GRUU (Globally Routable User Agent) The RTP Problem The Firewall Problem Solving the RTP Problem Symmetric RTP Media Proxy Application Level Gateway SIP Aware Firewalls -呼入 SIP Aware Firewalls - 呼出 Session Border Controllers SBC for the Enterprise and SBC for the ITSP Recommended Session Border Controller features SBCs in Action! SBCs and message manipulation / normalization SIP ‘Refer’ problems SBC ‘Interop’ example SBC Manufacturers - examples From SIP to WebRTC (and back) Part 7：SIP 中继介绍和业务要求 SIP Trunks What is a SIP Trunk Alternative to TDM Separate Data and Voice connections Converging the network SIP Trunks and Codecs SIP Trunk Benefits SIP Trunking – In More Depth SIP Trunk Capabilities SIP Trunking Network Examples SIP Peering Peering problems? Least Cost routing (LCR) Disaster Recovery
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