It gives brief overview of Voice over Internet protocol. The protocols that are widely used SIP and H323 are briefly described. How the conventional telephone lines that has been using E1 and T1 are converged into same IP formate to communicate the information from the DCE to DTE are given in brief.
It gives brief insight on the RTP(Real Transport Protocol) and TCP vs UDP can also be traced such as TCP is a reliable connection oriented communication while UDP is connectionless communication can also be traced here in these slides.
If their is any kind of mistakes and flaws found I am highly delighted to correct the one.