H323 Channels in Java

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When a end point participates in an H323 session, it maintains several channels, as shown in Figure 64-9
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Figure 64-9 H323 channels Examining Figure 64-9, we see that an end point can support many simultaneous RTP media channels For each media type, there will typically be one send media channel and one receive media channel; thus, if audio and video are sent in separate RTP streams, there will typically be four media channels Accompanying the RTP media channels, there is one RTCP media control channel, as discussed in Section 643 All of the RTP and RTCP channels run over UDP In addition to the RTP/RTCP channels, two other channels are required, the call control channel and the call signaling channel The H245 call control channel is a TCP connection that carries H245 control messages Its principle tasks are (i) opening and closing media channels; and (ii) capability exchange, ie, before sending media, endpoints agree on and encoding algorithm H245, being a control protocol for real-time interactive applications, is analogous to RTSP, which is a control protocol for streaming of stored multimedia Finally, the Q931 call signaling channel provides classical telephone functionality, such as dial tone and ringing
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The gatekeeper is an optional H323 device Each gatekeeper is responsible for an H323 zone A typical deployment scenario is shown in Figure 6410 In this deployment scenario, the H323 terminals and the gatekeeper are all attached to the same LAN, and the H323 zone is the LAN itself If a zone has a gatekeeper, then all H323 terminals in the zone are required to communicate with it using the RAS protocol, which runs over TCP Address translation is one of the more important gatekeeper services Each terminal can have an alias address, such as the name of the person at the terminal, the e-mail address of the person at the terminal, etc The gateway translates these alias addresses to IP addresses This address translation service is similar to the DNS service, covered in Section 25 Another gatekeeper service is bandwidth management: the gatekeeper can limit the number of simultaneous real-time conferences in order to save some bandwidth for other applications running over the LAN Optionally, H323 calls can be routed through gatekeeper, which is useful for billing
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Figure 64-10 H323 terminals and gatekeeper on the same LAN H323 terminal must register itself with the gatekeeper in its zone When the H323 application is invoked at the terminal, the terminal uses RAS to send its IP address and alias (provided by user) to the gatekeeper If gatekeeper is present in a zone, each terminal in the zone must contact gatekeeper to ask permission to make a call Once it has permission, the terminal can send the gatekeeper an e-mail address, alias string or phone extension for the terminal it wants to call, which may be in another zone If necessary, a gatekeeper will poll other gatekeepers in other zones to resolve an IP address An excellent tutorial on H323 is provided by [Web ProForums] The reader is also encouraged to see [Rosenberg 1999] for an alternative architecture than H323 for providing telephone service in the Internet
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References
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[Web ProForum 1999] Tutorial on H323, http://wwwwebproforumcom/h323/indexhtml, 1999 [RFC 1889] H Schulzrinne, S Casner, R Frederick, and V Jacobson, RTP: A Transport Protocol for Real-Time Applications, [RFC 1889], 1996 [Schulzrinne 1997] Henning Schulzrinne's RTP site, http://wwwcscolumbiaedu/~hgs/rtp/, 1997 [Rosenberg 1999] J Rosenberg and Henning Schulzrinne, "The IETF Internet telephony architecture and protocols," IEEE Network, vol 13, pp1823, May/June 1999
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If you are interested in an Internet Draft relating to a certain subject or protocol enter the keyword(s) here Query: Press button to submit your query or reset the form: Submit Query Options:
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