scope:

This standard describes the ISDN Normal Call Transfer Service in terms of service definition and protocol and procedures needed for implementation.

Purpose

This standard is one of a series which defines and describes supplementary services within the context of an Integrated Services Digital Network (ISDN). The interaction of this service with other ISDN services is also included. The purpose of the standard is to allow maximum compatibility among network and userowned telecommunication equipment in order to increase the attractiveness and usefulness of ISDN-based capabilities.

Application

This service applies to an ISDN Basic Rate Interface (BRI) and is intended to supplement the basic circuit-mode bearer services contained in American National Standard for Telecommunications - Integrated Services Digital Network (ISDN) - Circuit-mode bearer service category description, ANSI T1.620-1991. It should be used in conjunction with other ISDN standards for ISDN supplementary services for a complete understanding of the interactions between this and other ISDN services.

This supplementary service is applicable to the Speech and 3.1 kHz audio (Voiceband Data), and 64 kbit/s, unrestricted, 8 kHz structured bearer service category (see ANSI T1.620-1991).