In telephony, common-channel signaling (CCS), in the US also common-channel interoffice signaling (CCIS), is the transmission of signaling information (control information) on a separate channel from the data, and, more specifically, where that signaling channel controls multiple data channels. For example, in the public switched telephone network...
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http://en.wikipedia.org/wiki/Common-channel_signaling
(from the article `telephone and telephone system`) In order to overcome these issues and to speed the call set-up process in long-distance calls, another form of interoffice signaling, known as common ...
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http://www.britannica.com/eb/a-z/c/116
Transmission signaling information on a common channel shared between multiple service channels, as in mobile systems like GSM or fixed systems such as ISDN. Telecommunications core networks also use SS7, which is, formally, `Common Channel Signaling System Number 7`. MAP is the application layer above SS7 in the GSM core network.
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http://www.encyclo.co.uk/visitor-contributions.php
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