TWI currently has facilities in many countries throughout the world. Using VPN technology, TWI is able to connect its worldwide locations onto one network. The VPN utilizes either satellite or dedicated Internet bandwidth to connect all sites and terminate on their public switch telephone network (pstn). With the use of a class 4 switching platform, SS7 is distributed throughout the network to ensure efficiency. TWI is continuously striving to improve and develop its network to provide its customers with a consistently reliable service.