UNE-ETS 300356-5ED1

Integrated Services Digital Network (ISDN);Signalling System No.7;ISDN User Part (ISUP) version 2 for the international interface;Part 5: Connected Line Identification Presentation (COLP) supplementary service [ITU-T Recommendation Q.731, clause 5 (1993), modified] (Endorsed by Asociación Espanola de Normalización in June of 2022.)