Softswitch
Johnson I Agbinya · Auerbach Publications eBooks · 2009
The traditional public switched telephone network (PSTN) and the Internet (or other Internet protocol-based networks) require specific paths for the traditional or VoIP call to take from the source to the destination. Duplex channels are required for transmit and receive operations. The traditional fixed-network Internet requires three basic functions: routing, transmission, and billing. These three requirements must be translated for IP communications.