Common Channel Signaling
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Common Channel Signalling (CCS) is the transmission of signaling information out of the information band.
Basically, one channel out of an E1 or T1 will be used for the sole purpose of carrying signalling for establishment and torn down of calls. In CCS, no signaling information is carried over the voice connections.
The most notable and widely used form of this signaling type is ISDN. SS7 also uses Common Channel Signaling.