ISDN many types of business, and its operational capacity is developed. ISDN business during classification Guided by the following principles: (1) ISDN should be able to continue to provide existing networks, including the public switched telephone network, packet data network, cable network, etc. Users can provide the user needs all the business (2) ISDN business should take into account the existing ISDN network interworking and compatibility (3) ISDN business needs to fully estimate the user s new business requirements, including the near future may be the emergence of new communications needs. ISDN telecommunication services can be divided into basic transmission functions to provide carrier services (bearer services), and includes end-user terminal operations functions (teleservices). In addition to these two basic services but also provides for changes or additions to the basic business of supplementary services (supplementary services). Use of these supplementary se

ISDN.doc

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