Defining Basics of Voice, VoIP and IP telephony
Confusion has come along with the associated taxonomy of VoIP technology and IP telephony. Both of them refer to use the same IP network to send voice messages. But the main difference between VoIP and IP telephony is that VoIP is connecting old fashion analog phones to specific gateway device who are able to convert analog voice data into digital bits and send them across the internet bypassing the expensive PSTN telephone networks. In the case of IP telephony the phones by them selves are digital devices and they are made to record the users voice directly into digital signal and send it across IP network using special Communication manager devices that are enabling this technology to work. IP telephony technology resides on IP network and natively uses the IP network for communication.
In this article we will commence with the definition of voice over IP and bearing in mind that it is truly vital in the corporate world these days. Since voice packets are continually flowing or “gushing” across a “data infrastructure”, many protocols are needed to be arranged or set up in order to maintain it in a preserving manner, and keep a simple call going.
Example of VoIP vs IP telephony topology:
“Packetized” voice is sent over an IP network by VoIP. Well, characteristically, an IP network can also serve as a data network, the outcome is intended quality of protection problems. But luckily, Cisco will offer you a wide collection of (QoS) quality of service. And many features related to protection and security to make sure the eminence of quality and protection of the “voice transmission”.
Several business networks can voluntarily be linked without purchasing committed rent lines between their sites or depend on public switched telephone network (PSTN) with the ability to transmit voice over an IP network. The example is internet, which does not compel to pay charges for particular and specific call types i.e. the international calls or long distance.
In order to further illuminate and exemplify the differences between IP telephony and VoIP, you can take a look at upper image. In the topmost and north segment of our figure, the endpoints of the VoIP network are in fact an analog phone which means that they are linked to an analog port through a gateway and also a (PBX) private branch exchange that have been linked to a digital port on a completely different gateway. Since none of these endpoints locally speak IP, the topology is considered to be, none other than a VoIP network.
The lower segment of our image shows a ‘Cisco IP phone’ that does not interact locally in IP. This Cisco IP phone has been registered with a Cisco Unified Communications Manager Server; this phenomenon makes the call direction-finding conclusions for the Cisco IP phone. That is why; the lower “topology” in this particular figure is considered to be an IP telephony network. These were the differences on VoIP and IP telephony. You must understand that some particular type of text may use the terms IP telephony and VoIP without any change.