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Trunked radio service providers
Telephone network operators, wireless local loop
Telephone network operators, analog
Telephone network operators, digital
Telephone network operators, fibre optics
Telephone accounting and billing systems
Telecommunication systems, satellite, mobile
Telephone ringing machines
Call announcers for telephones
Telephone announcement systems, recorded
Information systems, telephone, voice activated
Integrated services digital network (ISDN) switches
Teleloop systems, transmitter to hearing aid
Communication equipment, telephonic, for lifts
Security encryption equipment, telecommunication systems
Data communication systems, base to taxi
Telecommunications equipment, time division duplex (TDD)
Emergency call systems for motorways
Image transmission and compression-expansion equipment
Voice over DSL (VoDSL) equipment
Voice data systems, private networks
Integrated voice mail systems, private networks
Telephone branch exchanges, private, Internet protocol (IP PBX/VoIp PBX)
Key system/key telephone systems
Call systems, remote control, for the elderly and disabled
Telephone impulse transmitters, automatic
Telephone intercommunication equipment, selective
Telephone intercommunication equipment, conference
Telephone intercommunication systems, railway
Telephone intercommunication equipment, aircrew
Telephone intercommunication equipment, marine, shipborne
Telephone intercommunication equipment, sub-sea
Telephone intercommunication equipment, flameproof
Mobile telephones (cellular phones), second-hand
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
Telephone switchboards
Prisoner-to-warder call systems, prison complexes
