Integrated Services Digital Network (ISDN) - Call Forwarding Busy (CFB) supplementary service - Service description
Edition 2001-08-01

Information technology - High efficiency coding and media delivery in heterogeneous environments - Part 10: MPEG Media Transport Forward Error Correction (FEC) codes (Adopted ISO/IEC 23008-10:2015, first edition, 2015-04-15)
Edition 2016-12-01

Integrated Services Digital Network (ISDN) - Selective Call Forwarding (SCF) supplementary services (unconditional, busy and no reply) - Service description
Edition 1999-01-01

Digital cellular telecommunications system (Phase 2+) - Call Forwarding (CF) supplementary services - Stage 3 (GSM 04.82 version 7.0.2 Release 1998)
Edition 2000-03-01

Terrestrial Trunked Radio (TETRA) - Voice plus Data (V+D) - Part 11: Supplementary services stage 2 - Sub-part 4: Call Forwarding (CF)
Edition 2003-09-01

Terrestrial Trunked Radio (TETRA) - Voice plus Data (V+D) - Part 10: Supplementary services stage 1 - Sub-part 4: Call Forwarding (CF)
Edition 2003-12-01

Terrestrial Trunked Radio (TETRA) - Voice plus Data (V+D) - Part 12 : supplementary services stage 3 - Sub-part 4 : Call Forwarding (CF) (V1.3.0).

Intelligent Transport Systems (ITS); Vehicular Communications; GeoNetworking; - Part 4: Geographical addressing and forwarding for point-to-point and point-to-multipoint communications; Sub-part 1: Media-Independent Functionality (ETSI EN 302 636-4-1 V1.4.1 (2020-01)) (english version)
Edition 2020-04-01

TIA/EIA-41-D Based Network Enhancements for User Selective Call Forwarding (USCF)
Edition 2000-08

Terrestrial Trunked Radio (TETRA); Voice plus Data (V+D); - Part 12: Supplementary services stage 3; Sub-part 4: Call Forwarding (CF) (ETSI EN 300392-12-4 V1.4.1 (2016-07))
Edition 2016-10-01