This Recommendation
provides the dynamic description of basic telecommunication services. The
dynamic description shows the flow of events, and states within the service, in
a time-sequenced format and identifies all possible actions relevant to the
service as perceived by end-users.
Although the service is described from the end-user perspective it does
not concern details of the human-to-machine interface itself. In addition, the
service description considers the network as a single entity. For example,
information flows between nodes within the network are not shown. End-user perceptions of the service are shown
in terms of "user/network" interactions. Internal network actions are
included whenever they are or can be perceived by an end-user during the
operation of the service.