SCCP is a half-proprietary VoIP terminal control protocol defined by Cisco Systems, Inc., who uses it to control their Cisco 7960 and 7940 voice over IP terminals (phones). It is rumoured to be a descendant of IPDC or SGCP.
Other companies like Symbol Technologies and SocketIP have implemented this protocol in VoIP Terminals (phones) and Media Gateway Controllers or Softswitches.
A company named IPBlue has created a computerprogram, that fakes a telefone (Softphone), which is using SCCP for signaling, too. In fact appearing to the callproceding instance (Callmanager) as a 7960 IP-Hardphone.