We describe the architecture and implementation of our Internet teleph ony test-bed intended to replace the departmental PBX (telephone switch).  It interworks with the traditional telephone networks via a PSTN/IP gateway.  It also serves as a corporate or campus infrastructure for existing and future services like web, email, video and streaming media.  Initially intended for a few users, it will eventually replace the plain old telephones from our offices, due to the cost benefit and new services it offers. We also discuss common inter-operability problems between the PBX and the gateway.
['Wenyu Jiang', 'Jonathan Lennox', 'Henning Schulzrinne', 'Kundan Singh']
Towards junking the PBX: deploying IP telephony