Figure 8-33 H323 network in Software

Drawer QR Code JIS X 0510 in Software Figure 8-33 H323 network

Figure 8-33 H323 network
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SIP The IETF has also developed a set of protocols that are being applied in the implementation of IP telephony switching fabrics They are SIP, the Session Initiation Protocol, and SDP, the Session Description Protocol, a simple set of protocols that allow endpoints to locate one another, negotiate media stream properties, and establish media streams
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Figure 8-34 SIP network
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SIP defines the VoIP switching fabric in terms of logical endpoints that act on behalf of users and invite one another to establish a media stream It also defines additional server components that allow endpoints to locate the endpoints corresponding to specific users Redirect servers provide endpoints with alternative locations and proxy servers search for the desired user on behalf of the requesting endpoint SIP's functionality is comparable to H323 but the protocol is arguably more efficient in terms of the number of transactions required to set up a call and much easier to work with as it is textbased and quite similar to HTTP
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868 IP Switching Fabric Control Protocols
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Switching fabric control protocols are another form of signaling used by the switching control function to control switching fabric components In the case of an IP telephony switching fabric, these components are distributed across an IP network and consist of gateways and other media stream endpoints MGCP MGCP, the Media Gateway Control Protocol, was developed to allow the implementation of VoIP networks in which the switching control function could be centralized and developed independently of media gateways responsible for interconnecting VoIP media streams with other telephony circuits and with other VoIP media streams MGCP defines a master-slave relationship between a media gateway controller and a telephony gateway: In MGCP, a media gateway controller corresponds to the switching control function in the switching fabric implementation It is responsible for managing all of the switching resources, determining how a media stream should be established through the switching fabric, and for directing media gateways to perform the necessary interconnections In MGCP, a telephony gateway is a single instance of an interconnection function within a distributed VoIP network A telephony gateway is able to interconnect media stream channels and relay corresponding signaling information between the VoIP network and interconnected telephony circuits of other types MGCP is available as an IETF informational RFC and has been widely implemented
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Figure 8-35 MGCP architecture
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MEGACO / H248 The MEGACO protocol, also known as H248, is a specification under joint development8-12 by the IETF and ITU-T It expands on MGCP by specifying a robust framework for switching fabric control and provides extensibility for new types of gateway capabilities through the definition of new MEGACO packages It is expected that this specification will ultimately be adopted as the basis for switching fabric control in VoIP and all open switching fabric implementations MEGACO will allow switching fabric control implementations to manage media and signaling gateways, station servers, and individual stations (See 10 for more on the nature of each of these VoIP system products)
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8-12
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MEGAGO status At the time of writing, MEGACO / H248 had not yet been published as a standard
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87 Wireless Circuits
Wireless telephony circuits cut the cord between telephone stations and other equipment in a telephone network They do this by using radio frequency or infrared communication technology to eliminate wires, however the signalling and media stream protocols used in various wireless systems span the analog, digital, and packet approaches that we've already explored
871 Wireless Telephony
Wireless telephony links come in a huge variety of different forms Examples of common wireless telephony facilities include: 16 18 / 498 499 MHz cordless telephones 900 MHz cordless CT2 Personal Handyphone (PHS) Digital Enhanced Cordless Telecommunications (DECT) 80211 wireless IP telephones Radio telephones Specialized Mobile Radio (SMR) Cellular (AMPS, GSM, TDMA, CDMA) Aircraft public telephones Rail public telephones Local Multipoint Distribution Service (LMDS) Multi-channel Multipoint Distribution System (MMDS) Microwave links Satellite links
Despite the diversity of wireless options, the basic concepts of a wireless telephony circuit are very simple and are illustrated in Figure 8-36
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