The e*phone is a fully functioning Internet telephone that uses the Session Initiation Protocol (SIP) to set up calls and the Real-Time Transport Protocol (RTP) to transmit voice data. You can build a small PBX by connecting e*phones to a hub or your Ethernet LAN, or you can build a more fully functioning system, with redirection and programmable per-call processing, by using a SIP proxy server, such as sipd.
The e*phone will work with any other standards-compliant SIP device, including other SIP phones, gateways and PC-based applications such as sipc. For a minimal PBX, only an Ethernet network and two or more e*phones are required.
Since this is a prototype, we used a Lucent/Philips/Sprint phone enclosure (from RadioShack...). The hardware and printed circuit board is our own design. An earlier version, produced in two copies, used a Chinese phone shell.
Instructions for version 2.0.
Last updated by Henning Schulzrinne