This is a process of connection between a computer and an ordinary phone. For example, one can call from Skype to a cell phone by dialing a specific number.
Media gateway Mediant 3000 is a compact solution oriented on communication operators. It supports from 480 up to 4032 voice channels on OC-3/STM interfaces. This media gateway is suited for applications of medium density, compatible with IP and ATM networks or unified IP/ATM networks.