On Defining VoIP Telephone Systems - Business and Finance Articles
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 at the same time, resulting in potential quality and security issues. Fortunately, most infrastructure manufacturer's provides a collection of quality of service (QoS) and security measures to ensure the quality and security of voice transmissions.
The ability 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 on the public switched telephone network (PSTN), which imposes charges for several call types (for instance, long distance 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 refer to sending voice across an IP network. However, the principal distinction revolves around the endpoints used. For example, in the VoIP network, traditional analogue or digital circuits connect into an IP network, typically through some kind of gateway. However, VoIP telephone systems contain endpoints that natively communicate using IP.
To further illustrate the distinction between VoIP and IP telephony, look at the drawings below. In the top portion of the figure, the endpoints in the VoIP network are, an analogue phone (attached to an analogue port over a gateway) along with 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 regarded as a VoIP network. With VoIP, a Gateway or another 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 using a call manager or call processing server, that makes call routing decisions on the part of 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 with 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 aren't required inside the enterprise network. If a connection to the PSTN is needed, a voice enabled router or any other gateway has to be added where calls are given to the PSTN. IP telephony refers to 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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