Digital cellular telecommunications system (Phase 2+) - General Packet Radio Service (GPRS) - GPRS Tunnelling Protocol (GTP) across the Gn and Gp Interface (Endorsement of the English version EN 301 347 V6.4.1 (1999-11) as a German standard) (Endorsement of the English version EN 301 347 V6.6.1 (2000-06) as a German standard) (Endorsement of the English version EN 301 347 V6.7.1 (2000-11) as a German standard) (Endorsement of the English version EN 301 347 V6.8.1 (2000-12) as a German standard) (Endorsement of the English version EN 301 347 V7.1.1 (2000-01) as a German standard) (Endorsement of the English version EN 301 347 V7.3.1 (2000-06) as a German standard) (Endorsement of the English version EN 301 347 V7.4.1 (2000-11) as a German standard) (Endorsement of the English version EN 301 347 V7.5.1 (2000-12) as a German standard)

Digital cellular telecommunications system (Phase 2) - Full rate speech - Part 2: Transcoding (GSM 06.10 version 4.1.1)

Digital cellular telecommunications system (Phase 2) - Base Station System (BSS) equipment specification - Part 3: Transcoder aspects (GSM 11.24 version 4.3.1)

Digital cellular telecommunications system (Phase 2+) - General requirements on interworking between the Public Land Mobile Network (PLMN) and the Integrated Services Digital Network (ISDN) or Public Switched Telephone Network (PSTN) (Endorsement of the English version ETS 300 976 V 5.2.2 (1997-05) as a German standard) (Endorsement of the English version ETS 300 976 V 5.3.1 (1997-09) as a German standard) (Endorsement of the English version ETS 300 976 V 5.4.1 (1998-01) as a German standard) (Endorsement of the English version ETS 300 976 V 5.5.1 (1998-03) as a German standard) (Endorsement of the English version ETS 300 976 V 5.6.1 (1998-07) as a German standard) (Endorsement of the English version ETS 300 976 V 5.7.1 (1998-10) as a German standard) (Endorsement of the English version ETS 300 976 V 5.8.1 (1999-03) as a German standard) (Endorsement of the English version ETS 300 976 V 5.9.1 (1999-08) as a German standard) (Endorsement of the English version ETS 300 976 V 5.10.1 (2000-06) as a German standard)