On Defining VoIP Telephone Systems
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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, leading to potential quality and security issues. Fortunately, most infrastructure manufacturer's provides a collection of quality of service (QoS) and safety measures to ensure the quality and security of voice transmissions.
The capability 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 depending on the public switched telephone network (PSTN), which imposes charges for certain call types (as an example, international calls and international calls).
With the arrival of VoIP technology, some confusion has arisen around its associated nomenclature. For example, consider the terms VoIP and IP telephony. Both refer to sending voice across an IP network. However, the main distinction requires the endpoints being used. 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 excellence between VoIP and IP telephony, look at the drawings below. In the top portion of the figure, the endpoints inside VoIP network are, an analogue phone (attached to an analogue port on a gateway) along with a private branch exchange (PBX) (linked to a digital port over a different gateway). Because neither of those endpoints natively speaks IP, the topology is recognized as a VoIP network. With VoIP, a Gateway and 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 having a call manager or call processing server, helping to make call routing decisions with respect to the IP phone. Therefore, underneath topology inside figure is regarded 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 usually are not required inside the enterprise network. If a link with the PSTN is necessary, a voice enabled router or any other gateway has to be added where calls are sent 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 rather than the circuit switched PSTN.
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