Recommendation I.210
describes the principles for defining telecommunication services supported by
an ISDN including the concept of bearer services, teleservices and
supplementary services. It also provides the means for the definition and
description of such services.
The purpose of this
Recommendation is to define a recommended set of supplementary services to be
used in association with basic bearer services and with basic teleservices.
These definitions form the basis for detailed descriptions as given in
Recommendations I.251 to I.257, which are used to define the network
capabilities required.
Supplementary services are
described by prose definitions and descriptions and by dynamic descriptions
following the description method given in Recommendation I.130. The application
for supplementary services of the attribute technique described in
Recommendation I.140 is for further study.