Common Channel Inter-office Signaling. A technique where signaling for a number of channels is carried on a single common channel, in contrast to each channel carrying its own signaling information.

common channel interoffice signaling. A method in which labeled messages convey signaling and call completion information over a single circuit, leaving other circuits free for voice, data or video transmissions. common control switching arrangement (CCSA) - Network service that directs inward and outward dialing typically with a seven-digit code. Originally designed as a feature for private networks. Now seen in virtual switched private line networks.

Common Channel Interoffice Signaling. An AT&T system for sending signals between central offices.

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