Free CCNA voice 640-461 Lecture Urdu IT academy <br /> <br />http://urduitacademy.com <br /> <br />http://urduitacademy.blogspot.com <br /> <br />Free Lectures on Cisco Voice VOIP / Ip Telephone in Urdu / Hindi <br /> <br />In this lecture we will discuss about advantages of IP PBX over Analog/Digital PBX and brief introduction of Cisco Call Manager Express.
