SCS-Client is a SIP Soft-Phone from Siemens
From Website:
The SCS-Client is a powerful multimedia application that solves all of the PC-user’s communication needs by providing a wide range of communication features. The convergence of presence-based features and multimedia communication (audio, video, chat, instant messages and document file transfer) into a single application brings the idea of “polite telephony” into life and gives the user the right tool to exploit the possibilities of both the “old” and “new” telecommunication worlds.
Phone System 