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ISDN Basic Rate Interface Call Control Switching and Signaling Generic Requirements

Document Number GR-268
Issue Number 01
Issue Date Jul 1998
Replaces TR-TSY-000268 Issue03

    This document addresses the protocol and procedural requirements on the local switching system for serving Integrated Services
    Digital Network (ISDN) Basic Rate Interface (BRI) customers. It addresses call establishment and clearing procedures for signaling
    over the user-network interface and interworking with existing networks. Interexchange ISDN calls are not covered except for packet
    mode calls and those calls that connect to non-ISDN users (i.e., users who are served through analog telephone lines, covered in
    TR-NWT-000444,Switching System Requirements Supporting ISDN Access Using the ISDN User Part). Calls to non-ISDN users are
    referred to as interworking calls.

    This document emphasizes basic call establishment procedures such as call setup, call progress treatment, connect, answer, and
    disconnect. Circuit-mode and packet-mode call procedures are defined. This document provides requirements for the National ISDN (NI)
    platform. It also contains requirements that are currently not supported by NI. This document is based on the fundamental concepts
    described in the ITU-T1-series Recommendations.

    The following documents were fully or partly replaced by GR-268: TR-TSY-000268, TR-TSY-000268-SUP01, TA-TSY-000035, TA-TSY-000790,
    TA-TSY-000791, TA-TSY-000792, TA-TSY-000794, TA-TSY-000795, and TA-TSY-000880, TR-TSY-000268 is erroneously referred to as
    "TR-TSY-000286" in GR-505; GR-268 is now the right reference.

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