Common Channel Signaling (CCS) is the transmission of signaling information out of the information band.
In CCS, one channel of a communications link is be used for the sole purpose of carrying signaling for establishment and tear down of calls. The remaining channels are used entirely for the transmission of voice or data. In most cases a single 64kbit/s channel is sufficient to handle the call setup and teardown traffic for numerous voice and data channels.
The most common CCS signalling methods in use today are ISDN and SS7.
Short for Signaling System 7, a telecommunications protocol defined by the International Telecommunication Union (ITU) as a way to offload PSTN data traffic congestion onto a wireless or wireline digital broadband network
SS7 defines the procedures for setting-up, managing and clearing down calls between users, as well as non-circuit related signaling
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