This Recommendation covers the related but perhaps different requirements of the ISDN
ITU-T E.184-1993 Referenced Document
ITU-T E.180 Technical Characteristics of Tones for the Telephone Service - Series E: Overall Network Operation Telephone Service Service Operation and Human Factors - Operation Numbering Routing and Mobile Services - International Operation - Tones in National Signal*, 1998-03-01 Update
ITU-T E.182 Application of Tones and Recorded Announcements in Telephone Services - Series E: Overall Network Operation Telephone Service Service Operation and Human Factors - Operation Numbering Routing and Mobile Services - International Operation - Tones in Nation*, 1998-03-01 Update
ITU-T E.184 Indications to Users of ISDN Terminals
1988ITU-T E.184-1988 Indications to Users of ISDN Terminals - Telephone Network and ISDN - Operation, Numbering, Routing and Mobile Service (Study Group II) 2 pp