Question 113 - 312-38 discussion

The Voice over Internet Protocol (VoIP) is used for routing of voice conversation over the Internet. The VoIP is also known by other names such as IP Telephony, Broadband Telephony, etc. Analog signals are used in telephones in which the sound is received as electrical pulsation, which is amplified and then carried to a small loudspeaker attached to the other phone, and the call receiver can hear the sound. In VoIP, analog signals are changed into digital signals, which are transmitted on the Internet. VoIP is used to make free phone calls using an Internet connection, and this can be done by using any VoIP software available in the market. There are various modes for making phone calls through the Internet. Some of the important modes are as follows:

Through Analog Telephone Adapter (ATA) In this mode, the traditional phone is attached to the computer through AT

A. ATA receives analog signals from the phone and then converts these signals to digital signals. The digital signals are then received by the Internet Service Providers (ISP), and the system is ready to make calls over VoIP.

Through IP Phone IP Phones look exactly like the traditional phones, but they differ in that they have RJ-45 Ethernet connectors, instead of RJ-11 phone connectors, for connecting to the computers.

Computer To Computer This is the easiest way to use VoIP. For this, we need software, microphone, speakers, sound card and an Internet connection through a cable or a DSL modem.

Soft Phones

Soft phone is a software application that can be loaded onto a computer and used anywhere in the broadband connectivity area.