主页（http://www.pttcn.net）：SIP 相关技术系列讲座开讲(3) MIME MIME Multiple MIME parts SIP and the PSTN SIP and the PSTN SIP to PSTN Detail SIP to PSTN Call Flow SIP Codes and the PSTN SIP and B2BUA B2BUA - Back to Back User Agent B2BUA Example B2BUA Benefits and Features SIP ‘Call Process’ Summary The Call Process Part 2：Wireshark 工具 Wireshark What is Wireshark? Download Wireshark Wireshark Introduction Menus, Screens and Views Capturing traffic Profiles Display Filters Capture Filters SIP Packet Analysis SIP ladders and Audio Playback Other Menu options SIP INVITE Analysis Follow a UDP Stream Frame Relationships Colouring Rules RTP Streams View Captures in the ‘Cloud’ What are the codes? Part 3：SIP/PSTN 介绍 SIP-T and the PSTN SIP to PSTN Overview SIP to PSTN Call Flow SIP to PSTN Detail PSTN to SIP Call Flow SIP to PSTN Call Failure SIP to PSTN Call trace Early Media Early Media - SIP to PSTN Call Early Offer and Delayed Offer Early Offer / Delayed Offer Gateways
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