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'''SCCP''' is a proprietary terminal control protocol originally developed by Selsius Corporation. It is now owned and defined by [[Cisco Systems, Inc.]] as a messaging set between a skinny client and the Cisco [[CallManager]]. Examples of skinny clients include the Cisco 7900 series of IP phone such as the [[Cisco 7960]], [[Cisco 7940]] and the [[802.11b]] wireless [[Cisco 7920]]. Skinny is a lightweight protocol which allows for efficient communication with Cisco Call Manager. Call Manager acts as a signalling proxy for call events initiated over other common protocols such as [[H.323]], [[SIP]], [[ISDN]] and/or [[MGCP]].
A skinny client uses [[TCP/IP]] to and from one or more Call Managers in a cluster. [[Real-time Transport Protocol|RTP]]/[[User Datagram Protocol|UDP]]/[[Internet Protocol]]|IP] is used to and from a similar skinny client or H.323 terminal for the bearer traffic (real-time audio stream). SCCP is a stimulus-based protocol and is designed as a communications protocol for hardware endpoints and other embedded systems, with significant CPU and memory constraints.
Cisco acquired SCCP technology when it acquired Selsius Corporation in the late 1990's. As a remnant of the Selsius origin of the current Cisco IP phones, the default device name format for registered Cisco phones with CallManager is SEP -- as in ''Selsius Ethernet Phone'' -- followed by the [[MAC address]].
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A company named [http://www.ipblue.com/ IPBlue] has created a software phone ([[soft phone]]) which uses SCCP for signaling, too. This phone in fact appears to the Cisco [[CallManager]] server as a 7960 hardware phone.
In addition, Cisco has come out with its own version of a skinny softphone called Cisco IP Communicator as well as SIP-based softphone called Cisco Unified Personal Communicator. Previously, Cisco had a JTAPI/CTI version of a softphone called Cisco IP Softphone.
[[Category:VoIP protocols]]
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