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What are the elements of a VoIP network?

The functions of the various components are easily understandable, although it is worth to emphasize certain ideas.

The Gatekeeper is an optional element in the network, but when present, all other elements to contact the network must use that. Its function is the management and control of network resources, so that situations do not occur in the same saturation.

The Gateway is an essential element in most networks because its mission is to connect the VoIP network with the analogue telephone network or ISDN. We consider the Gateway as a box on one side has a LAN interface and the other has one or more of the following interfaces:

* FXO. For connection to PBXs or extensions to the basic telephone network.

* FXS. Links for connection to PBX or analog phones.

* E & M. For specific connection to PBXs.

* BRI. ISDN Basic Access (2B + D)

* PRI. ISDN Primary Rate (30B + D)

* G703/G.704. (E & M digital) specifies connection to 2 Mbps PBX

VoIP Business Solutions

The various components can reside on separate physical platforms, or we can find several elements coexisting in the same platform. Thus it is quite common to find together Gatekeeper and Gateway. We can also see how Cisco has implemented the Gateway functions on the router.

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