The present document specifies the stage three of the Security tools (SET) procedures for the pan-European Integrated
Services Digital Network (ISDN) as provided by the European public telecommunications operators at the T reference
point or coincident S and T reference point (as defined in ITU-T Recommendation I.411 [2]) by means of the Digital
Subscriber Signalling System No. one (DSS1) protocol. Stage three identifies the protocol procedures and switching
functions needed to support a telecommunications service (see ITU-T Recommendation I.130 - see bibliography).
In addition, the present document specifies the protocol requirements at the T reference point where the service is
provided to the user via an intermediate private ISDN.
The present document does not specify the additional protocol requirements where the service is provided to the user
via a telecommunications network that is not an ISDN.
The SET procedures are a means of providing an appropriate level of security and protection to the user of a given
telecommunication service by the use of the following Security tools:
PIN (Personal Identification Number),
TAN (Transaction Number).
Further parts of the present document specify the method of testing required to identify conformance to the present
document.