IP Telephony PBX PBA Doha Qatar Components

IP Telephony PBX PBA Doha Qatar Components
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An IP Telephony PBX PBA Doha Qatar network contains four main voice-specific components:
? IP phones: IP phones are used to place calls in an IP Telephony PBX PBA Doha Qatar network. They perform voice-to-IP (and vice versa) coding and compression using special hardware. IP phones offer services such as user directory lookups and Internet access. The phones are active network devices that require power to operate; power is supplied through the LAN connection using PoE or with an external power supply.
? Switches with inline power: Switches with inline power (PoE) enable the modular wiring closet infrastructure to provide centralized power for Cisco IP Telephony PBX PBA Doha Qatar networks. These switches are similar to traditional switches, with an added option to provide power to the LAN ports where IP phones are connected. The switches also perform some basic QoS tasks, such as packet classification, which is required for prioritizing voice through the network.
? Call-processing manager: The call-processing manager, such as a Cisco Unified Communications Manager, provides central call control and configuration management for IP phones. It provides the core functionality to initialize IP Telephony PBX PBA Doha Qatar devices and to perform call setup and call routing throughout the network. Cisco Unified Communications Manager can be clustered to provide a distributed, scalable, and highly available IP Telephony PBX PBA Doha Qatar model. Adding more servers to a cluster of servers provides more capacity to the system.
? Voice gateway: Voice gateways, also called voice-enabled routers or voice-enabled switches, provide voice services such as voice-to-IP coding and compression, PSTN access, IP packet routing, backup call processing, and voice services. Backup call processing allows voice gateways to take over call processing in case the primary call-processing manager fails. Voice gateways typically support a subset of the call-processing functionality supported by the Cisco Unified Communications Manager.
Other components of an IP Telephony PBX PBA Doha Qatar network include a robust IP network, voice messaging and applications, and digital signal processor resources to process voice functions in hardware, which is much faster than doing it in software. These components are located throughout the enterprise network, as illustrated in Figure 3-21.
Figure 3-21 IP Telephony PBX PBA Doha Qatar Components
Voice Messaging and Applications
Call-Processing Engine
Cisco Unified Communications
Voice Messaging and Applications
Call-Processing Engine
rDSP Resources for Conferencing
C IP WAN V
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