VoIP Call is the easiest way to make calls around the world. VoIP is a form of internet telephony. The 3 main elements that the VoIP system comprises of are: the sender, the IP network and the receiver. Starting its journey in the late 20th century, VoIP Technology is the latest advancement made in the field of telecommunication.
Components
The necessary components of a VoIP system that makes VoIP calling possible are as follows:
IP Devices: The most basic of all necessary item is a device with internet access to make the call. Internet connection from WIFI or cellular service is enough to make VoIP Phone calls. Computers, laptops and similar devices are also compatible with making VoIP Calls with an internet connection.
Media Gateways: The media gateway connects the IP network to the PSTN and allows those 2 networks to connect. For PSTN, gateways handle not only IP signalling functions but also support local exchange. Whereas for VoIP, gateways handle a wide variety of traffic.
Softswitch: Softswitch signals the media gateways that transport the traffic. Softswitch uses established protocol and ensures that the information is communicated between the gateways.
IP PBX: The main purpose of IP PBX is switching calls between VoIP users and users on local lines while allowing all users to share a certain number of external phone lines.
The Packet-switched Network
The place where VoIP Calls differ from the traditional calls is its use of the network. While traditional calls use the circuit-based network, VoIP Calls use the packet switched network. In the packet switched network, the terminal splits up the information into blocks of moderate size called packets. These autonomous packets are capable of moving on the network as they have a header containing the source and the destination addresses. Thereafter leaving the source, the packet goes to the first node in this communication network.
VoIP Call Transmission
An alternate term for nodes is routers. The router examines the header on receiving the packet. It then forwards the packet to the next appropriate routes. This process of “store and forward” goes on through all the routers of the path until the packet reaches its destination, unless it is lost. Upon reaching the destination, the terminal at that point removes the header and obtains the actual data which originated at the source.
Therefore, the benefit of a packet switched network is that in this transmission, resources are allocated without sharing. On the downside multiplexing of different connection on the same resource may cause delays or packet loss. In conclusion, considering all the pros and cons, VoIP calls still stand as the better options for all calling purposes.
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