Cellular Data Communication Protocol - CC

CC

GSM 04.08 http://www.etsi.fr

The call control (CC) protocol is one of the protocols of the Connection Management (CM) sublayer. Every mobile station must support the call control protocol. If a mobile station does not support any bearer capability at all then it must respond to a SETUP message with a RELEASE COMPLETE message. In the call control protocol, more than one CC entity are defined. Each CC entity is independent from each other and communicates with the correspondent peer entity using its own MM connection. Different CC entities use different transaction identifiers.

Certain sequences of actions of the two peer entities compose elementary procedures. These elementary procedures may be grouped into the following classes:

• Call establishment procedures.
• Call clearing procedures.
• Call information phase procedures.
• Miscellaneous procedures.

The terms "mobile originating" or "mobile originated" (MO) are used to describe a call initiated by the mobile station. The terms "mobile terminating" or "mobile terminated" (MT) are used to describe a call initiated by the network.