On Defining VoIP Telephone Systems
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On Defining VoIP Telephone Systems
VoIP sends packetized voiceover an IP network. Typically, the IP network serves as a data network too, resulting in potential quality and security issues. Fortunately, most infrastructure manufacturer's comes with a collection of quality of service (QoS) and security features to ensure the quality and security of voice transmissions.
The capability to transmit voice over an IP network (for example, the Internet) allows many corporate networks to readily interconnect their sites without purchasing dedicated leased lines between their sites or depending upon the public switched telephone network (PSTN), which imposes charges for sure call types (for instance, cross country and international calls).
With the appearance of VoIP technology, some confusion has arisen around its associated nomenclature. For example, think about the terms VoIP and IP telephony. Both reference sending voice across an IP network. However, the main distinction requires the endpoints in use. For example, inside a VoIP network, traditional analogue or digital circuits connect into an IP network, typically through some sort of gateway. However, VoIP telephone systems contain endpoints that natively communicate using IP.
To further illustrate the distinction between VoIP and IP telephony, take into account the drawings below. In the top portion of the figure, the endpoints within the VoIP network are, an analogue phone (attached to an analogue port with a gateway) plus a private branch exchange (PBX) (linked to a digital port with a different gateway). Because neither of such endpoints natively speaks IP, the topology is considered a VoIP network. With VoIP, a Gateway or any other 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 which has a call manager or call processing server, that makes call routing decisions on behalf of the IP phone. Therefore, underneath topology in the 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 by using an appliance, server or cloud based for call control and signalling, rather than PBXs. The IP Phone itself performs voice-to-IP conversion, and voice enabled routers are not required within the enterprise network. If a connection to the PSTN is necessary, a voice enabled router or another gateway has to be added where calls are given to the PSTN. IP telephony is the term for cost-effective communication services, including voice, fax and voice messaging applications, transported through packet-switched IP network as opposed to the circuit switched PSTN.
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