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For example, a call from an IP telephony client to a conventional telephone is routed over the IP network to the H.323 gateway, which translates H.323 signaling to conventional telephone signaling, such as Signaling System 7 (SS7), and then routes the call over the conventional telephone network to its destination. IP multicast conferencing The Multicast Conference Service Provider included with TAPI 3.1 provides support for IP multicast-based audio and video conferencing between multiple participants. IP multicasts support multi-user conferences by using a single connection instead of multiple connections, which conserves network bandwidth.
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All routers between the Windows XP Professional client and other conferencing participants must support IP multicasting. Windows 2000 Server and Windows Server 2003 provide a multicast-enabled Dynamic Host Configuration Protocol (DHCP) server that can allocate a unique IP address for the duration of the conference.
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Client/Server Telephony
You can configure a computer running Windows 2000 Server or Windows Server 2003 as a telephony server, providing an interface between the PBX switch and workstations enabled to use TAPI. For example, a LAN server might have multiple telephone-line connections to a local telephone switch or PBX. An associated client starts TAPI operations and forwards them over the LAN to the server. The server uses third-party call control between the server and the PBX to implement the client s call-control requests. Figure 26-2 shows an example of a PBX system configured with a telephony server.
PSTN PBX
Server
PBX phone Client PBX phone Client
Figure 26-2
Client/server telephony using PBX
The PBX switch can connect to the server using a switch-to-host link. You can also directly connect a PBX switch to the LAN on which the server and associated clients reside. Within these distributed configurations, different subconfigurations are possible, such as:
To provide personal telephony to each client, the service provider can model the PBX line associated with the client as a single-line device with one channel. Each client would have one line device available.
Single-line device model. Separate-line device model. Each third-party station can be modeled as a separate-line device to allow applications to control calls on other stations. (A station is anything to which a wire leads from the PBX switch.) This subconfiguration requires that the application open each line it wants to manipulate or monitor.
Part IV:
Networking
Windows XP Professional workstations locate the telephony server through auto discovery of the published telephony service object in Active Directory . After communication is established with the telephony server, users at the Windows XP Professional computer can perform basic and advanced call control functions, such as placing, answering, and terminating calls to the PBX switch or PSTN through the computer. Installation of third-party telephony services that conform to TAPI 3.1 standards can enable advanced functions, such as computer-telephony integration (CTI) functions. For more information about client/server telephony, see Configuring Client/Server Telephony Support later in this chapter.
Public Switched Telephone Network
Historically, most telephone connections in the world have been made by using the PSTN. Most PSTN calls are transmitted digitally except while in the local loop, the part of the telephone network between the telephone and the telephone company s central switching office. Within this loop, speech from a telephone is usually transmitted in analog format. Digital data from a computer must first be converted to analog by a modem. The modem is installed in the computer and connected to the computer by the serial port or by a Universal Serial Bus connection. The data is converted at the receiving end by another modem, which changes the data from audio to its original data form. Windows XP Professional provides basic telephony call support for modems using PSTN lines, such as dialing and call termination. Windows XP Professional provides device drivers for a number of internal and external analog modems, which can be automatically installed by using Plug and Play or manually installed by using the Add Hardware Wizard in Control Panel.
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