prSSH ETS 300 267-1:1994 ed.1

Integrated Services Digital Network (ISDN); Telephony 7 kHz and videotelephony teleservices Digital Subscriber Signalling System No. one (DSS1) protocol Part 1: Protocol specification

Scope

This first part of ETS 300 267 specifies the stage three of the videotelephony and telephony 7 kHz teleservices for the pan-European Integrated Services Digital Network (ISDN) as provided by European public telecommunications operators at the T reference point or coincident S and T reference point (as defined in CCITT Recommendation I.411 [4]) by means of the Digital Subscriber Signalling System No. one (DSS1). Stage three identifies the protocol procedures and switching functions needed to support a telecommunications service (see CCITT Recommendation I.130 [3]). In addition, this ETS specifies the protocol requirements at the T reference point where the service is provided to the user via a private ISDN. This ETS does not specify the additional protocol requirements where the service is provided to the user via a telecommunications network that is not an ISDN. For the telephony 7 kHz and videotelephony teleservice, this ETS specifies procedures for commencement of the in-band protocol by normative reference to the relevant in-band protocol ETSs.