Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. The Bearer Independent Call Control (BICC) is a signaling protocol based on N-ISUP that is used for supporting narrowband ISDN service over a broadband backbone network. BICC is designed to interwork with existing transport technologies. BICC is specified in ITU-T recommendation Q.1901. BICC signaling messages are nearly identical to those in ISUP; the main difference being that the narrowband Circuit Identification Code (CIC) has been removed from the header. The BICC architecture consists of interconnected Serving Nodes that provide the Call Service Function and the Bearer Control Function. The Call Service Function uses BICC signaling for call setup and may also interwork with ISUP. The Bearer Control Function receives directives from the Call Service Function via BICC Bearer Control Protocol (ITU-T recommendation Q.1950) and is responsible for setup and teardown of bearer paths on a set of physical transport links. Transport links are most commonly TDM, ATM or IP.

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