21CN

21CN

21st Century Network. A British Telecom project for migrating telephony services from PSTN to an end to end IP based network.21CN is designed to support voice, video and data services.

For more information see:

• www.btplc.com/21CN/Thetechnologyofthenetwork/Thetechnologyofthenetwork.htm - BT's 21st Century Network; The technology of the new network.