ATLANTA -- Ulticom, Inc. a leading provider of service-enabling signaling software for wireless, wireline and Internet communications begins today a three-day showcase of its Signalware software on the Linux operating system, as part of an interoperability demonstration with IBM Corporation. The demonstration, on display at IBM, Booth Number 20446, features the combined carrier-grade signaling and hardware platform capabilities as essential ingredients of a reference circuit-to-packet inter-working application. Signalware satisfies a rapidly emerging demand for Session Initiation Protocol (SIP)-based telephony and circuit-to-packet convergence by enabling carrier-grade telephone calls to be seamlessly initiated and/or received between SIP-based equipment in Internet Protocol (IP) networks and traditional equipment operating in the public Switched Circuit Network (SCN). The demonstration shows implementation of an inter-working call control function using Signalware SIP and Signalware Signaling System Number Seven (SS7) software running on Linux to control SIP-initiated calls and route them through the SS7-signaled SCN. In a real-world implementation, calls also would be placed from "classical" SCN-based wireline and wireless phones to SIP phones connected to IP networks. Ulticom Inc. IBM Corp.