On Defining VoIP Telephone Systems - Business and Finance Articles
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On Defining VoIP Telephone Systems - Business and Finance Articles
VoIP sends packetized voice over an IP network. Typically, the IP network serves as a data network also, producing potential quality and security issues. Fortunately, most infrastructure manufacturer's offers a collection of quality of service (QoS) and security measures to ensure the quality and security of voice transmissions.
The capacity to transmit voiceover an IP network (for instance, the Internet) allows many corporate networks to readily interconnect their sites without purchasing dedicated leased lines between their sites or relying on the public switched telephone network (PSTN), which imposes charges for certain call types (by way of example, long-distance and international calls).
With the appearance of VoIP technology, some confusion has arisen around its associated nomenclature. For example, look at the terms VoIP and IP telephony. Both make reference to sending voice across an IP network. However, the primary distinction requires the endpoints being used. For example, in a VoIP network, traditional analogue or digital circuits connect into an IP network, typically through some form of gateway. However, VoIP telephone systems contain endpoints that natively communicate using IP.
To further illustrate the distinction between VoIP and IP telephony, think about the drawings below. In the top portion of the figure, the endpoints in the VoIP network are, an analogue phone (connected to an analogue port with a gateway) as well as a private branch exchange (PBX) (attached to a digital port over a different gateway). Because neither of the endpoints natively speaks IP, the topology is recognized as a VoIP network. With VoIP, a Gateway or another device protects the conversion of Voice into IP packets.
The bottom portion of the drawings shows an IP phone, which does natively communicate using IP. The IP phone registers using a call manager or call processing server, that makes call routing decisions on behalf of the IP phone. Therefore, the lower topology inside figure is known as an IP telephony network. With IP telephony the VoIP telephone systems take care on the conversion of Voice into IP packets. Realize, however, that some literature might use the terms VoIP and IP telephony interchangeably.
IP telephony replaces traditional phones with VoIP telephone systems and uses call processing software, normally on an appliance, server or cloud based for call control and signalling, instead of PBXs. The IP Phone itself performs voice-to-IP conversion, and voice enabled routers are not required within the enterprise network. If a link with the PSTN is needed, a voice enabled router or another gateway have to be added where calls are sent to the PSTN. IP telephony describes cost-effective communication services, including voice, fax and voice messaging applications, transported through the packet-switched IP network as opposed to the circuit switched PSTN.
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