The present document defines the stage one of the Selective Call Forwarding (SCF) supplementary service for the
pan-European Integrated Services Digital Network (ISDN) as provided by European public telecommunications
operators. Stage one is an overall service description from the users point of view, but does not deal with the details of
the human interface itself.
The present document defines the interworking requirements of private ISDNs with the public ISDN.
In addition the present document specifies the base functionality where the service is provided to the user via a private
ISDN.
The present document does not specify the additional requirements where the service is provided to the user via a
telecommunications network that is not an ISDN but does include interworking requirements of other networks with the
public ISDN.
Charging principles are outside the scope of the present document.
Interaction with supplementary services not listed in clauses 7 and 8 are outside the scope of the present document.
The present document deals with the selection mechanisms of the SCF supplementary service. For details of the
mechanisms by which calls are forwarded, refer to the service descriptions of the call forwarding supplementary services
(see ETS 300 200 [5], ETS 300 199 [6], and ETS 300 201 [7]).
The SCF supplementary service enables a served user to specify the forwarding of their incoming calls to a selected
destination subject to certain conditions or circumstances e.g. the calling line identity of the calling user.
The SCF supplementary service is applicable to all circuit-switched telecommunication services.
The present document is applicable to the stage two and stage three standards for the ISDN SCF supplementary service.
The terms "stage two" and "stage three" are also defined in CCITT Recommendation I.130 [1]. Where the text indicates
the status of a requirement (i.e. as strict command or pr (...abbreviated)