VoIP helps to transfer the voice signals to pass through IP network
easily. The basic working of the VoIP takes place in two steps. In
the first half the analog signals are converted to digital signals.
Then these signals are converted and compressed into IP protocols
in order to provide access to the internet. The second step is the
reverse of this process, when the signals reach at the receiver's
end they are aging converted to analog signals. The voice signals
are controlled by session control protocol, this protocol helps in
the process of audio codec. Audio codec refers to the encoding of
voice signals to travel over an IP arrangement. This process also
monitors the tear down of calls. The process of audio codec is somewhat
complex, because analog signals are converted to digital signals through
either through audio streaming or using narrowband.