主頁（http://www.130131.com）：SIP 相關(guān)技術(shù)系列講座開講(5) Measuring Delay Jitter and Packet Loss General VoIP Acceptance Criteria QoS across all Networks 802.1Q – VLANs 802.1Q/P Tagging 802.1P - L2 Classification TOS and DiffServe Layer 3 Classification DSCP with Assured forwarding (AF) Bandwidth decisions Link options – Symmetric DSL (SDSL) Bandwidth (kbps) vs. Packet per Second (pps) Network Behavior Analysis Issues that can affect QoS SIP trunking SIP, SDP and VoIP SIP in the TCP/IP Model SIP and SDP Messages (e.g. Invite and 200OK) SIP and SDP Codec mapping Video over IP What is Video over IP? Streaming Voice and Video – 1 Way Transmission Two-way Conferencing with RTP Codec and Bandwidth Considerations Video bitrate Calculator Setting Video Codecs on Devices Audio and Video in the SDP body Assured SIP Services Assured SIP intro Service Provider Architecture Proxy and Access Router functions Resource-Priority Video ‘example’ Reason Header for Pre-emption Events More Proxy details Multi-Level Pre-emption and Precedence (MLPP) Part 5：SIP Security Authentication and Authorization SIP Proxy Authentication 401 and 407 Authorization SIP Authorization PROXY Authentication SSL with MD5 Cracked! MD5 v SHA Encryption Why Encrypt SIP? Certificates and HTTPS Certificate Authorities Certificate Example Self-Signed Certificates Format type Securing SIP and VoIP SSL and TLS SIP and TLS TLS Thoughts TLS and SIP in Action SIPS and SIP Addressing Secure RTP (SRTP) Setting SRTP on SIP Devices Secure RTP (SRTP) - Example SRTP and SRTCP sdes and the Crypto attribute Crypto attribute example SRTP Call example ‘showing’ Crypto SRTP with ZRTP RFC 4474 for Caller Identity Caller Identity DTLS/SRTP Ongoing developments for Identity S/MIME and SIP MIME and ISUP SIP Trunking and Security Enhancing SIP Trunk Security Attacks and Responses Types of Attack on a VoIP/SIP Network Responses and Protection
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