Integrated Services Digital Network (ISDN); Connected Line Identification Presentation (COLP) and Connected Line Identification Restriction (COLR) Supplementary Services Functional Capabilities and Information Flows
"This standard defines the stage two of the pan-European Integrated Services Digital Network (ISDN) as provided by the European public telecommunications operators for the Connected Line Identification Presentation (COLP) and Connected Line Identification Restriction (COLR) supplementary services. Stage two identifies the functional capabilities and the information flows needed to support the service description. The stage two description also identifies user operations not directly associated with a call (see CCITT Recommendation I.130 [1]). This standard is defined according to the methodology specified in CCITT Recommendation Q.65 [2]. This standard does not formally describe the relation between these supplementary service and the basic call but@ where possible@ this information is included for guidance. In addition this standard does not specify the requirements where the service is provided to the user via a private ISDN. This standard does not specify the requirements for the allocation of defined functional entities within a private ISDN; it does however define which functional entities may be allocated to a private ISDN. This standard does not specify the additional requirements where the service is provided to the user via a telecommunications network that is not an ISDN. The COLP supplementary service provides the calling party with the possibility to receive identification of the connected party. The COLR supplementary service enables the connected party to prevent presentation of its ISDN number to the calling party. The COLP and COLR supplementary services are applicable to all telecommunication services. This standard is applicable to the stage three standards for the ISDN COLP and COLR supplementary services. The term ""stage three"" is defined in CCITT Recommendation I.130 [1]. Where the text indicates the status of a requirement@ i.e. as a strict command or prohibition@ as authorisation leaving freedom@ as a capability or possibility@ this shall be reflected in the text of the relevant stage three standards. Furthermore@ conformance to this standard is met by conforming to the stage three standards with the field of application appropriate to the equipment being implemented. Therefore@ no method of testing is provided for this standard"