Integrated Services Digital Network (ISDN) – Call Waiting Supplementary Service
|Publication Date:||1 April 1991|
Scope and purpose
This standard is one of a series that 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 user- owned telecommunication equipment in order to increase the attractiveness and usefulness of ISDN-based capabilities.