On Defining Voip Telephone Systems
On Defining Voip Telephone Systems
VoIP sends packetized voice over an IP network. Typically, the IP network serves as a data network at the same time, causing potential quality and security issues. Fortunately, most infrastructure manufacturers supplies a collection of quality of service (QoS) and safety measures to ensure the quality and security of voice transmissions.
The power to transmit voiceover an IP network (as an example, the Internet) allows many corporate networks to readily interconnect their sites without purchasing dedicated leased lines between their sites or counting on the public switched telephone network (PSTN), which imposes charges for many call types (for example, long-distance and international calls).
With the arrival of VoIP technology, some confusion has arisen around its associated nomenclature. For example, look at the terms VoIP and IP telephony. Both reference sending voice across an IP network. However, the key distinction involves the endpoints in use. For example, inside a 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 difference between VoIP and IP telephony, look at the drawings below. In the top portion of the figure, the endpoints inside the VoIP network are, an analogue phone (connected to an analogue port over a gateway) plus a private branch exchange (PBX) (associated with a digital port on a different gateway). Because neither of such endpoints natively speaks IP, the topology is recognized as a VoIP network. With VoIP, a Gateway and 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 having a call manager or call processing server, helping to make call routing decisions for the IP phone. Therefore, the underside topology inside figure is recognized as an IP telephony network. With IP telephony the VoIP telephone systems be aware 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, instead of PBXs. The IP Phone itself performs voice-to-IP conversion, and voice enabled routers are certainly not required within 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 forwarded to the PSTN. IP telephony identifies 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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