Terminal Equipment (TE) - Attachment requirements for pan-European approval for connection to the analogue Public Switched Telephone Networks (PSTNs) of TE supporting the voice telephony service in wich network addressing, if provided, is by means of Dual Tone Multi Frequency (DTMF) signalling (Endorsement of the English version EN 301437 V 1.1.1 (1999-06) as German standard)
Edition 2000-10

Attachements to the Public Switched Telephone Network (PSTN) - General technical requirements for equipment connected to an analogue subscriber interface in the PSTN (Endorsement of the English version EN 300001 V 1.5.1 (1998-10) as German Standard)
Edition 2000-09

Human Factors (HF) - Human factors requirements for a European Telephony Numbering Space (ETNS) (Endorsement of the English version EN 301104 V 1.1.1 (1998-10) as German standard)
Edition 2000-04

Terminal Equipment (TE) - Integrated Services Digital Network (ISDN) - B-Channel Aggregation Unit (CAU); procedures and terminal requirements (Endorsement of the English version EN 300481 V 1.2.2 (1997-12) as German standard)
Edition 2000-04

Attachment requirements for Data Terminal Equipment (DTE) to connect to public networks that have physical and electrical network presentations based upon the ITU-T V-series of recommendations (Endorsement of the English version EN 301401 V 1.2.6 (1999-10) as German standard)
Edition 2001-04