主页（http://www.pttcn.net）：SIP 相关技术系列讲座开讲(4) Default Gateway? Gateway Location and Routing with TRIP TRIP Examples SIP-T and PSTN Bridging SIP-T and SIP-I SS7, ISDN and SIP ISUP and SIP Messages ISDN User Part (ISUP) to SIP Codes PSTN to PSTN via SIP ISUP Encapsulation ISUP Encapsulation / SDP Addressing Notes SIP and DTMF DTMF - Quick Re-Cap What is DTMF? DTMF Transport methods DTMF ‘Inband’ RFC 2833 ‘Trace’ example RFC 4733 replaces 2833 RFC 4734 SIP INFO 6086 RFC 2833 ‘Trace’ example SIP INFO ‘Trace’ example Part 4：SIP/QOS/RTP介绍 What is VoIP or Voice over IP? What is VoIP? What is Voice over IP? VoIP – ‘A Basic Call’ VoIP and TCP / UDP VoIP over the Internet Branch to Branch VoIP Signaling paths Speech paths IP PBX Voice Sampling and Codec Encoding Codecs for Voice Try the Codec Test High Definition (HD) Voice Sound tests Wideband (HD) codecs Opus codec Opus audio examples Codec choices and MOS – Mean Opinion scores Packet Rate / Packets per second The Real Time Protocol or RTP RTP Intro RTP Encapsulation RTP Header Trace Real Time Control Protocol (RTCP) RTCP-XR (Extended Reports) RTP / RTCP and UDP Ports Quality of Service QoS described QoS Issues
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