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Telephone conferencing services
Video conferencing/teleconferencing services
Internet telephony service providers (VOIP)
Voice transmission via power lines (voice over power line)
Integrated services digital network (ISDN) services
Trunked radio service providers
Network providers for mobile telephones (cellular phones)
Universal mobile telecommunications system (UMTS) services
International telephone calling services
Telecommunication operators
Telephone network operators, wireless local loop
Telephone network operators, analog
Telephone network operators, digital
Holding companies, telecommunications
Telecommunication systems, satellite, mobile
Telephone answering machines
Integrated services digital network (ISDN) switches
Telecommunications equipment, time division duplex (TDD)
Emergency call systems for motorways
Call centre management systems
Image transmission and compression-expansion equipment
Voice over DSL (VoDSL) equipment
Voice data systems, private networks
Integrated voice mail systems, private networks
Key system/key telephone systems
Telephones, feature and novelty
Telephone intercommunication equipment, conference
Music on hold and digital announcer systems for telephone systems
Telecommunications network equipment, fibre to the curb systems (FTTC)
Telecommunications network equipment, fibre to the home systems (FTTH)
Telecommunications network equipment, fibre in the loop systems (FITL)
Telecommunications network equipment, hybrid fibre-coaxial (HFC)
Photonic networking systems
Local multipoint distribution service (LMDS) network equipment
