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 too, leading to potential quality and security issues. Fortunately, most infrastructure manufacturer's supplies a collection of quality of service (QoS) and security features to ensure the quality and security of voice transmissions.
The power to transmit voice over 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 depending upon the public switched telephone network (PSTN), which imposes charges for several call types (by way of example, long distance and international calls).
With the advent 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 main distinction revolves around the endpoints being 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 excellence 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 on the gateway) plus a private branch exchange (PBX) (connected to a digital port with a different gateway). Because neither of the endpoints natively speaks IP, the topology is known as 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 using a call manager or call processing server, that makes call routing decisions for the IP phone. Therefore, the underside topology within the figure is recognized 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 with an appliance, server or cloud based for call control and signalling, as opposed to 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 required, a voice enabled router or other gateway should be added where calls are given to the PSTN. IP telephony identifies cost-effective communication services, including voice, fax and voice messaging applications, transported through packet-switched IP network rather than the circuit switched PSTN.
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