Protocols and the TCP/IP Suite Overview and Discussion

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Presentation transcript:

Protocols and the TCP/IP Suite Overview and Discussion Voice-over-IP Overview and Discussion Chapter 2

Protocols and the TCP/IP Suite ITU VoIP Network Model Gatekeeper PSTN Internet Gateway Zone Terminal Chapter 2

Protocols and the TCP/IP Suite ITU H.323 Architecture Control Application Speech G.7xx compression Q.931 Call Signaling H.245 Call Control H.225 RAS RTCP RTP UDP TCP IP Data Link Protocol Physical Layer Protocol Chapter 2

Protocols and the TCP/IP Suite ITU H.323 Logical Channels Call signaling channel (Q.931) Call control channel (H.245) Forward data channel (RTP) >>>> <<<< Reverse data channel (RTP) Data control channel (RTCP) Caller Callee Chapter 2

Protocols and the TCP/IP Suite IETF Architecture Speech Control Application Compression Gateway Location Protocol Session Initiation Protocol RTCP RTP SDP UDP TCP/UDP IP Data Link Protocol Physical Layer Protocol Chapter 2

H.323 Call Flow

H.323 Call Flow 1 Endpoint A sends a setup message to Endpoint B on TCP Port 1720. 2 Endpoint B replies to the setup message with an alerting message and a port number to start H.245 negotiation. 3 H.245 negotiation includes codec types (G.729 and G.723.1), port numbers for the RTP streams, and notification of other capabilities the endpoints have. 4 Logical channels for the UDP stream are then negotiated, opened, and acknowledged. 5 Voice is then carried over RTP streams. 6 Real Time Transport Control Protocol is used to transmit information about the RTP stream to both endpoints.

Virtual Switch Controller

Protocols and the TCP/IP Suite Protocols and the TCP/IP Suite Typical SIP Control Flow Chapter 2

VoIP Class Discussion Topics Protocols and the TCP/IP Suite VoIP Class Discussion Topics VoIP <-> PSTN Comparison (Varshey, et. al.) differences coexistence/evolution Performance Issues in Practice (James, et.al.) packet loss speech coding/compression silence suppression and echo delay and jitter Reliability Issues (Johnson, et. al.) Chapter 2