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, leading to potential quality and security issues. Fortunately, most infrastructure manufacturers provides a collection of quality of service (QoS) and security measures 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 relying on the public switched telephone network (PSTN), which imposes charges for many call types (for instance, international calls and international calls).
With the arrival of VoIP technology, some confusion has arisen around its associated nomenclature. For example, think about the terms VoIP and IP telephony. Both make reference to sending voice across an IP network. However, the main distinction involves the endpoints being used. For example, in a very VoIP network, traditional analogue or digital circuits connect into an IP network, typically through some type of gateway. However, VoIP telephone systems contain endpoints that natively communicate using IP.
To further illustrate the excellence between VoIP and IP telephony, think about the drawings below. In the top portion of the figure, the endpoints inside the VoIP network are, an analogue phone (attached to an analogue port on the gateway) plus a private branch exchange (PBX) (linked to a digital port on the different gateway). Because neither of those endpoints natively speaks IP, the topology is recognized as a VoIP network. With VoIP, a Gateway or any other device manages 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 with a call manager or call processing server, making call routing decisions for the IP phone. Therefore, the underside topology inside the figure is recognized as an IP telephony network. With IP telephony the VoIP telephone systems be mindful 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 while on 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 usually are not required inside the enterprise network. If a link to the PSTN is essential, a voice enabled router or any other gateway has to be added where calls are forwarded 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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