Designed to move organisations towards IP whilst protecting the investment already made in legacy PBX systems, the ICS3 (InterChange Convergence Switch3), provides a risk free migration path to true network convergence supporting both VoIP and IP Telephony (IPT) interworking. The ICS3 can be deployed on any DPNSS, QSIG or Q.931 network. It offers three choices to an organisation: move to VoIP while retaining central business critical services; gradually phase in IP telephony in a controlled manner; or use both VoIP and IP telephony in the same converged and resilient network.

Regardless of the IP migration route chosen, installing an ICS3 between the PBX and the LAN provides all the integration needed without any loss of voice quality or functionality of the network.