What is a Session Border Controller and how it is different from VoIP Gateway?

Session Border Controller Before I start explaining what is a Session Border Controller, let me first explain the architecture of a typical VoIP network, which will help you visualize and understand the purpose and functionality of SBC easily. In a typical company, each employee has an extension on his/her desk connected to an IP PBX or phone system. The phone system may be connected to the outside world using a...