Digital cellular telecommunications system (Phase 2) - Attachment requirements for Global System for Mobile communications (GSM) - Mobile stations in the DCS-1800-band and additional GSM 800 band; Telephony (GSM 13.02 version 4.0.1) (Endorsement of the English version EN 301420 V 4.0.1 (1999-12) as German standard)
Edition 2003-04

Integrated Services Digital Network (ISDN); 3,1 kHz telephony teleservice; end-to-end compatibility requirements for telephony terminals; english version ETS 300082:1992
Edition 1992-06

Integrated Sevices Digital Network (ISDN); 3,1 kHz telephony teleservice; attachment requirements for handset terminals; english version ETS 300085:1990
Edition 1992-02

Terminal Equipment (TE) - Telephony for hearing impaired people - Characteristics of telephone sets that provide additional receiving amplification for the benefit of the hearing impaired; English version ETS 300488:1996
Edition 1996-08

Terminal Equipment (TE) - Telephony for the hearing impaired - Electrical coupling of telephone sets to hearing aids; English version ETS 300679:1996
Edition 1997-11

Information technology - UPnP Device Architecture - Part 26-1: Telephony device control protocol - Level 2 - Telephony architecture
Edition 2017-09

Information technology - UPnP Device Architecture - Part 26-2: Telephony device control protocol - Level 2 - Telephony client device
Edition 2017-09

Information technology - UPnP Device Architecture - Part 26-3: Telephony device control protocol - Level 2 - Telephony server device
Edition 2017-09

Terminal Equipment (TE) - Telephony for hearing impaired people - Characteristics of telephone sets that provide additional receiving amplification for the benefit of the hearing impaired
Edition 2001-10-01

Glossary of electrotechnical, power, telecommunication, electronics, lighting and colour terms. Terms particular to telecommunications and electronics. Telephony
Edition 1993-11-15