The IPT Environment

The PBX connectivity environment is replicated precisely in a pure IP telephony environment. Each of the connectivity points previously discussed and shown in Figure 2-1 are duplicated on the IP network, using IP infrastructure components. As shown iiFigure 2-2, an Ethernet (or network) switch on the corporate LAN provides the connectivity for the IP clients, such as desktop and laptop workstations. These clients (also referred to as devices) are designed to interface to the IP network by using a built-in or modular Ethernet adapter to connect to the network switch on the network.

Figure 2-2. Desktop Connectivity for IP Workstations

Figure 2-2. Desktop Connectivity for IP Workstations

In Figure 2-2, each device has a corresponding port on the network switch; that is, each of the desktop workstations and laptops has an associated network switch port for connectivity into the IP network. This holds true for the network router shown for intersite IP communications and network printers (not shown).

In Figure 2-3, IP phone connectivity into the IP network, the network switch duplicates the functionality of the line card in a traditional PBX environment. In other words, the network switch replaces the line card for desktop telephone connectivity. In a pure IP telephony environment, an IP phone is designed to interface with a network switch port in its native form, just like other traditional IP clients. A true IP phone uses established IP network protocols for communication sessions, and interfaces with the network cabling plan using an RJ-45 connection.

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