Message Telecommunications Service

- absent-subscriber service
- address service
- advanced mobile phone service
- advanced mobile phone service/digital
- aeronautical service
- aeronautical broadcasting service
- aeronautical fixed service
- aeronautical mobile service
- aeronautical radionavigation service
- aeronautical telecommunication service
- aircraft control and warning service
- alternative line service
- amateur service
- analog communication service
- answering service
- around-the-clock service
- beacon service
- bibliographic retrieval service
- BIOS services
- British Forces broadcasting service
- broadcasting service
- broadcasting satellite service
- broadcast videotex service
- bulletin board service
- cable broadband service
- cable modem service
- call service
- circuit emulation service
- citizens' radio service
- coding-decoding service
- communication service
- connection service
- connectionless network service
- connection-oriented network service
- cryptographic service
- DAB service
- data service
- dialed number identification service
- digital advanced mobile phone service
- digital audio broadcasting service
- digital music service
- directory service
- directory inquiry service
- directory synchronization service
- distributed file services
- E911 service
- echo cancellation service
- e-mail service
- emergency service
- emergency radio service
- encoding-decoding service
- end-by-end service
- electronic service
- extended 911 service
- facsimile service
- field service
- general packet radio service
- general security service
- hop-by-hop service
- industrial radio services
- information service
- instructional television fixed service
- integrated packet switching service
- intelligent messaging service
- intermittent service
- international communication service
- international packet switched service
- international telecommunications service
- Knowbot information service
- land mobile service
- land-transportation radio services
- local multipoint distribution service
- location service
- long-distance service
- management information service
- maritime mobile service
- maritime radionavigation service
- maritime radionavigation satellite service
- mass call service
- media service
- message service
- message handling service
- message transport protocol service
- messenger service
- meteorological aids service
- Microsoft consulting service
- mobile service
- mobile radio service
- multipoint communication service
- multipoint distribution service
- narrow-band advanced mobile phone service
- national data processing service
- national mobile radio service
- NetWare distributed print services
- network file service
- network information service
- network protocol service
- new technology directory service
- news service
- NT directory service
- on-line information service
- personal communication service
- personal locator service
- personal-radio service
- plain old telephone service
- positioning service
- private-line service
- public radiocommunication service
- public telephone service
- radiodetermination service
- radio information service
- radiolocation service
- radionavigation service
- radionavigation satellite service
- redirection service
- remote service
- remote computing service
- rescue-and-recovery service
- resource administrative service
- running service
- satellite digital audio radio services
- security service
- short message service
- signaling service
- sound-program service
- standard-frequency service
- standard positioning service
- subscriber-based broadcast service
- switched multimegabit data service
- teleinformatic services
- telemetric service
- telephoto service
- teletypewriter-exchange service
- terminal service
- timed signal service
- toll service
- TWX service
- value-added service
- videophone service
- visual-telephone service
- virtual channel service
- virtual terminal service
- voice messaging service
- Web network file service
- wide area telephone service
- wire service
- wired subscription service
- wired videotex service
- wireless 911 service
- wireless communication service
- wireless data service

- absent-subscriber service
- address service
- advanced mobile phone service
- advanced mobile phone service/digital
- aeronautical broadcasting service
- aeronautical fixed service
- aeronautical mobile service
- aeronautical radionavigation service
- aeronautical service
- aeronautical telecommunication service
- aircraft control and warning service
- alternative line service
- amateur service
- analog communication service
- answering service
- around-the-clock service
- beacon service
- bibliographic retrieval service
- BIOS services
- British Forces broadcasting service
- broadcast videotex service
- broadcasting satellite service
- broadcasting service
- bulletin board service
- cable broadband service
- cable modem service
- call service
- circuit emulation service
- citizens' radio service
- coding-decoding service
- communication service
- connection service
- connectionless network service
- connection-oriented network service
- cryptographic service
- DAB service
- data service
- dialed number identification service
- digital advanced mobile phone service
- digital audio broadcasting service
- digital music service
- directory inquiry service
- directory service
- directory synchronization service
- distributed file services
- E911 service
- echo cancellation service
- electronic service
- e-mail service
- emergency radio service
- emergency service
- encoding-decoding service
- end-by-end service
- extended 911 service
- facsimile service
- field service
- general packet radio service
- general security service
- hop-by-hop service
- industrial radio services
- information service
- instructional television fixed service
- integrated packet switching service
- intelligent messaging service
- intermittent service
- international communication service
- international packet switched service
- international telecommunications service
- Knowbot information service
- land mobile service
- land-transportation radio services
- local multipoint distribution service
- location service
- long-distance service
- management information service
- maritime mobile service
- maritime radionavigation satellite service
- maritime radionavigation service
- mass call service
- media service
- message handling service
- message service
- message transport protocol service
- messenger service
- meteorological aids service
- Microsoft consulting service
- mobile radio service
- mobile service
- multipoint communication service
- multipoint distribution service
- narrow-band advanced mobile phone service
- national data processing service
- national mobile radio service
- NetWare distributed print services
- network file service
- network information service
- network protocol service
- new technology directory service
- news service
- NT directory service
- on-line information service
- out of service
- personal communication service
- personal locator service
- personal-radio service
- plain old telephone service
- positioning service
- private-line service
- public radiocommunication service
- public telephone service
- radio information service
- radiodetermination service
- radiolocation service
- radionavigation satellite service
- radionavigation service
- redirection service
- remote computing service
- remote service
- rescue-and-recovery service
- resource administrative service
- running service
- satellite digital audio radio services
- security service
- short message service
- signaling service
- sound-program service
- standard positioning service
- standard-frequency service
- subscriber-based broadcast service
- switched multimegabit data service
- teleinformatic services
- telemetric service
- telephoto service
- teletypewriter-exchange service
- terminal service
- timed signal service
- toll service
- TWX service
- value-added service
- videophone service
- virtual channel service
- virtual terminal service
- visual-telephone service
- voice messaging service
- Web network file service
- wide area telephone service
- wire service
- wired subscription service
- wired videotex service
- wireless 911 service
- wireless communication service
- wireless data service

- 700 service
- 800 service
- 900 service
- abbreviated-dialing service
- absent-subscriber service
- advanced communication service
- aeronautical telecommunication service
- aeronautical-fixed service
- aeronautical-mobile off-route service
- aeronautical-mobile route service
- aeronautical-mobile satellite service
- aeronautical-multicom service
- aeronautical-radionavigation satellite service
- aeronautical-radionavigation service
- air-ground radiotelephone service
- alerting service
- amateur-satellite service
- ancillary service
- application-free service
- asymmetrical interactive service
- attendant service
- audio-description service
- audiovisual multimedia service
- authorization control service
- automatic bank-reference service
- automatic connection service
- base services
- bearer service
- broadband service
- broadcasting service
- broadcasting-satellite service
- bulletin-board service
- Bureaufax service
- cable-TV service
- call service
- carrier service
- C-band fixed satellite service
- cellular service
- cellular-messaging service
- Centrex® service
- channel service
- circuit-switched data-transmission service
- citizen's radio service
- coin service
- communication-network service
- confravision service
- connectionless service
- connection-oriented service
- consolidated local-telecommunications service
- constant bit-rate service
- control service
- conversational service
- crytical service
- CTX service
- data-retrieval service
- data-transmission service
- data-transport service
- Datel service
- dedicated service
- demand service
- digital-terrestrial service
- direct-dialing service
- directory-inquiry service
- direct-to-home service
- distribution service
- district service
- document-communication service
- document-distribution service
- document-management service
- document-retrieval service
- domestic-fixed public service
- domestic-public radio service
- DTMF service
- Earth exploration-satellite service
- eight-hundred service
- electronic-mail service
- emergency service
- enhanced service
- enquiry service
- entertainment service
- essential service
- extended-area service
- five-hundred service
- fixed-satellite service
- flat-rate service
- foreign-exchange service
- fractional T1 service
- free-phone service
- FT1 service
- gated service
- general telegraph service
- global satellite multimedia services
- high resolution image communication service
- high speed data service
- image communication service
- in-building service
- information channel service
- interactive on-line services
- interactive-multimedia services
- internal communication service
- international telecommunication service
- international telephone service
- international television service
- interruption-free service
- intersatellite service
- isochronous service
- Kilostream service
- land mobile service
- land-mobile satellite service
- land-transportation radio service
- large-volume file-transfer service
- MAILbus service
- main service
- marine-mobile service
- maritime-mobile satellite service
- maritime-radionavigation satellite service
- Megastream service
- messaging service
- meteorological aids service
- meteorological satellite service
- mobile-air service
- mobile-data service
- mobile-phone service
- mobile-satellite service
- monochrome-television service
- multimedia-communication service
- multipoint-distribution service
- naming service
- national weather service
- Netbios name service
- Netbios session service service
- network information service
- nine-hundred service
- nondelay service
- nonreal-time service
- nonswitched service
- nonvoice service
- numeric service
- one-way audiovisual distribution service
- on-line service
- operational-fixed services
- opportunistic service
- packet-switched service
- personal multimedia services
- personal radio service
- person-to-person service
- port-operations service
- presentation service
- private NS/EP telecommunication services
- private-line service
- public data-transmission service
- public radio communication service
- public-message service
- public-switched digital service
- public-switched NS/EP telecommunication service
- radio broadcast service
- radio center annunciation service
- radio monitoring service
- radiocommunication service
- radiodetermination-satellite service
- radionavigation-satellite service
- radiopaging service
- real-time service
- recorded-information service
- reference service
- resale service
- reserved-circuit service
- retrieval service
- route aeronautical-mobile service
- rural-radio service
- safety service
- satellite television service
- seven-hundred service
- shared service
- short-message service
- short-time service
- signaling service
- single service
- space-operation service
- space-research service
- special-radio service
- SQL-service
- standard frequency-and-time signal satellite service
- subscriber access service
- subscriber trunk dialing service
- T1 service
- teleaction service
- telecommunication service
- telecommunication-service priority service
- telefax service
- teleinformatic services
- telematic service
- telemetering service
- telephoto service
- Teletail service
- teletex service
- teletypewriter exchange service
- terminal information service
- terrestrial mobile service
- thin-route service
- three-party service
- time-signal service
- toll service
- trunking service
- universal service
- Usenet-support service
- user-to-user service
- value-added service
- variable bit rate service
- video-audio information transmitting service
- videoconference service
- videophone service
- videotex service
- virtual service
- VISTA service
- voiceless communication service
- wide area telephone service
- wired subscription service
- wireless cable services

- acoustic alarm system
- acoustic image system
- acoustic systems
- actiontrack system
- active IR-system
- actuator system
- adaptive communication system
- adaptive teleinformation system
- adaptive telemetering system
- advanced information system
- Afsatcom system
- air system
- aircraft intercommunication system
- airfield communication system
- air-ground automatic system
- airline reservation system
- air-to-ground TV system
- alarm signal system
- alarm system
- all-channel signaling system
- ALL-IN-ONE system
- alphanumeric system
- amplified speaker system
- amplitude shift-keying system
- AMPS system
- analog cellular communication system
- analog cellular system
- analog component video system
- analog television system
- analog tropospheric system
- anisochronous system
- antenna system
- antitheft system
- AR system
- Arabsat system
- ASK system
- associated channel analog system
- asynchronous address communication system
- audio recording system
- Aurora system
- Aussat system
- automatic communication system
- automatic connection establishment system
- automatic control system
- automatic data acquisition system
- automatic telegraphy system
- automatic telephone system
- automatic tuning system
- automatized cellular system
- auxiliary alarm system
- balanced cable transmission system
- band sharing system
- base station system
- baseband system
- basic input/output system
- bass-reflex speaker system
- batch processing system
- batch transmission system
- batch-and-forward system
- batteryless system
- bilateral CTV system
- binary tariff system
- biocontrol system
- bit parallel interface system
- bit transport system
- bridge duplex system
- broadband mobile system
- broadcast satellite system
- broadcasting delivery media systems
- burglar alarm system
- byte-serial interface system
- cabinet system
- cabinetless system
- cable distribution system
- cable TV system
- call-accounting system
- call-answering system
- call-counting system
- call-distributing system
- call-processing system
- call-queueing system
- camp-on system
- CAPTAIN system
- car component audio system
- carrier reinsertion system
- carrier system
- carrier-communication system
- carrier-current communication system
- Cassegrain-Schmidt system
- cassette recording system
- cassette reproducing system
- CATRIN system
- caution system
- CD 900 system
- cellular system
- cellular-radio system
- central-battery system
- centralized control system
- chirp binary telegraph system
- cipher system
- circuit switched telecommunication system
- circuit switching telecommunication system
- circular telecontrol system
- clock system
- closed-circuit communication system
- closed-circuit telegraph system
- closed-numbering system
- code-dependent system
- code-division multiple access system
- code-independent system
- code-insensitive system
- code-sensitive system
- coding system
- coherent fiber-optic system
- collimating system
- collocated system
- color separating system
- combined numbering system
- combined power supply system
- combined satellite communication system
- common-battery system
- common-carrier system
- common-channel signaling system
- common-engineering communication system
- common-purpose cellular system
- common-using band system
- common-using cordless telephone system
- common-using paging system
- communication system
- communication traffic system
- communications system
- community antenna system
- community antenna television system
- community TV-system
- commununication switching system
- compact disk digital audio system
- compatible color television system
- compatible single sideband system
- compatible single-band system
- compatible TV-system
- complex radio communication system
- computer vision system
- computer-telephone system
- Comsar system
- Comsat system
- Conax system
- concentrated-insonation system
- conference system
- conference-communication system
- congested system
- congress-class system
- constant-current system
- control generating system
- conventional television system
- Conversant system
- cordless-communication system
- crossbar system
- crossed-coincident microphone system
- Crosspoint system
- CSE system
- C-system
- cubical video projecting system
- data processing system
- data system
- data transport system
- data-collection system
- data-compression system
- data-exchange system
- dataflow system
- data-gathering system
- data-handling system
- data-measuring system
- data-reduction system
- data-transmission system
- Decca Navigator system
- DECfax system
- decision-feedback system
- dedicated control channel system
- dedicated multimedia system
- delta-sigma system
- deluxe presentation system
- departmental communication system
- desktop-video system
- DFS/Copernicus system
- dial-telephone system
- differential phase shift-keying system
- differential-duplex system
- differential-magnetic system
- digital camera system
- digital hybrid-key telephone system
- digital mass storage system
- digital microwave radio transmission system
- digital telephone communication system
- digital transmission system
- digital TV-communication system
- Digital UNIX system
- digital-analog system
- digital-cellular system
- digital-data modulation system
- digital-effect system
- digital-message entry system
- digital-termination system
- direct-broadcasting satellite system
- directing system
- direct-modulation system
- direct-sequence system
- direct-telephone communication system
- discrete communication system
- discrete sound system
- discrete-addressing system
- disk-operating system
- DISOSS system
- dispatch telephone communication system
- dispatch-center system
- dispersed-insonation system
- distributed-insonation system
- distributed-processing system
- documental-type communication system
- Dolby systems
- domestic satellite communication system
- double-band telephone communication system
- double-channel transmission system
- double-current transmission system
- double-pole communication system
- double-sideband large carrier system
- DSCS system
- D-system
- dual-cable system
- dual-reflector system
- duplexed system
- Earth-to-space transmission system
- ECM system
- electric communication system
- electronic antishock system
- electronic data-gathering system
- electronic data-processing system
- electronic-message system
- electronic-scanning system
- electronic-switching system
- Ellipso system
- emergency telephone communication system
- emergency-broadcast system
- EMX system
- equidistant system
- error-correction system
- error-detection system
- Eutelsat system
- extensible system
- external paging system
- facsimile system
- fast-acting servicing system
- fault-tolerant system
- fax communication system
- fax transmitting system
- feed system
- fiber transmission system
- fiber-optic transmission system
- field-sequential system
- final mile system
- finishing system
- fire alarm system
- fire warning system
- first generation cellular system
- five-channel communication system
- fixed satellite system
- Flexcam system
- flexible access system
- Flitsatcom system
- focusing system
- four-channel sound system
- four-dimensional system
- four-wire telephone communication system
- frame-sequential system
- frequency shift-keying system
- frequency-carrier system
- frequency-control system
- front-bass reflex speaker system
- fully digital system
- gate system
- Gaussian system
- generalized system
- generating dynamic system
- generator-dc-motor system
- GIGASET radio system
- global positioning system
- Global system
- Gopher system
- grandfathered system
- group-alerting and dispatching system
- guide system
- hard-wired CCTV system
- hazard system
- helical-scan system
- HF-synchronizing system
- high-precision navigating system
- Hi-linear system
- home system
- home-telephone system
- home-type system
- homing-guidance system
- host system
- hydroacoustic system
- ideal communication system
- idealized system
- image informaion system
- image-forming system
- immedial servicing system
- incompatible system
- independent system
- information retrieval system
- information system radio system
- information system
- information-feedback system
- information-measuring system
- infrared alarm system
- Inmarsat system
- Inmarsat-A system
- Inmarsat-B system
- Inmarsat-C system
- Inmarsat-D system
- Inmarsat-M system
- Inmarsat-P system
- integrated telephone system
- integrated videographic teleconferencing system
- integrated-antenna system
- integrated-communication system
- integrated-modulation system
- integrated-office system
- Intelsat system
- interactive system
- intercarrier-sound system
- intercommunication system
- intercontinental tropospheric system
- interlock system
- intermachine exchange system
- intermediate system
- international communication system
- interphone system
- Intervision system
- intraband signaling system
- intruder alarm system
- inward-outward dialing system
- ionoscatter system
- ionosphere sounder system
- ionospheric system
- Iridium system
- isolated system
- Italsat system
- J-carrier system
- joint-multichannel trunking and switching system
- K-carrier system
- key system
- key-telephone system
- land satellite communication system
- large-grained communication system
- laser communication system
- L-band satellite system
- L-carrier system
- Leasat system
- lightning protection system
- limited distortion system
- line amplifiers system
- link system
- little-channel relay system
- local alarm system
- local battery system
- local communication system
- local radio paging system
- long-haul system
- long-range system
- loop system
- loud-speaking communication system
- low-traffic system
- magnetic tape recording system
- Mail system
- management-information system
- manual cellular system system
- manual telephone set system
- Marisat system
- master television system
- master-antenna television system
- matrix sound system
- message feedback system
- message procession system
- message registration system
- message-switched system
- meteor radio system
- Metrobus system
- micro component system
- Micro Press Cluster Printing system
- micro-lens system
- microprocessor system
- microwave relay system
- midi system
- mine radio telephone system
- mini system
- mixed media system
- mixed numbering system
- mobile cellular communication system
- mobile land communication system
- mobile radio system
- mobile relay system
- mobile system
- modulated system
- monetary mobile system
- MS-Mail system
- multiareal system
- multicassette system
- multichannel telephone system
- multicomputer system
- multidisk system
- multiformat recording system
- multifrequency tone signaling system
- multiguard system
- multilevel mixed system
- multimedia system
- multiple-channel system
- multiqueue system
- Multiscrypt system
- multistandard system
- multitrack editing system
- mutibeam antenna system
- muting system
- Nagravision system
- NAMTS system
- narrow-angle TV system
- national communication system
- navigation system
- n-channel communication system
- n-channel DPSK system
- n-channel transmission system
- network standalone system
- network system
- network-operation system
- networks numbering system
- neutral direct-current telegraph system
- n-head video system
- NMT system
- noise-reduction system
- nonhoming tuning system
- noninterlaced television system
- nonsegmented system
- Norsat system
- n-satellite system system
- n-tone DPSK system
- n-tone MFSK system
- NTSC system
- NTT system
- obligatory message system
- Odyssey system
- off-line system
- on-line computer system
- on-line secured system
- open numbering system
- open system
- operative-engineering communication system
- opposite signals system
- optical-communication system
- optical-information system
- optical-projection system
- optoelectronic system
- oscillating system
- oscillation system
- outband signaling system
- package-and-resource tracking system
- pagemaster system
- paging system
- PAL system
- parametric system
- PATHWORKS system
- pattern recognition system
- personal holding guard system
- phase shift-keying system
- phone system
- Piccolo system
- pilot-controller system
- polar direct-current telegraph system
- portable mobile system
- power control system
- power controlling system
- power-line carrier system
- power-supply system
- press-to-talk system
- Prestel system
- primary-supply system
- privacy system
- private branch paging system
- private movable system
- private videodata system
- private videotex system
- process-interface system
- PROFS system
- programmable cross-connect system
- programmable cross-connected system
- programmed radio system
- prompting system
- protected wireline distribution system
- protection system
- pseudoquadraphony system
- pseudotrunking system
- public videodata system
- public videotex system
- pulse-code system
- pulse-frequency system
- pulse-time system
- quadraphonic sound system
- quadruple-diversity system
- R1 system
- R2 system
- radio buoy system
- radio command system
- radio communication system
- Radio Data system
- radio facsimile system
- Radiocom 2000 system
- radio-control system
- radio-paging system
- radio-relay system
- radiosonde-radio-wind system
- radio-telemetering system
- real time pulse-echo system
- real time system
- receiver lockout system
- recording system
- recovery system
- redundant system
- reference-information system
- regional electronic payment system
- relay-radio system
- remote concentrating system
- remote control system
- remote diagnostic system
- remote information system
- remote semiconcentrating system
- remote sensing system
- remote signaling system
- rendering system
- rerecording system
- reserved servicing system
- RF/Transmission system
- rotary system
- safety alarm system
- safety system
- Satcom system
- satellite comminication system
- satellite marine comminication system
- Satellite Master Antenna Television system
- satellite radio system
- satellite-aircraft communication system
- SB-communication system
- SBL communication system
- scalable system
- scanning trunking system
- SCO UNIX system
- searchless identification system
- seat reservation system
- SECAM system
- second generation cellular system
- second room system
- secondary supply system
- secrecy system
- section communication system
- security system
- segmented system
- seismic system
- selective calling system
- selective frequency base station system
- selective protective system
- selective telephone system
- self-adjusting system
- self-balancing differential system
- self-contained system
- self-test system
- selsyn system
- semiautomatic-switching system
- semiautomatized cellular system
- sensory system
- servo system
- shadow-batch system
- short-haul microwave system
- Sicral system
- Sigma Servo system
- signal system
- simplex movable system
- single-band transmission system
- single-busbar system
- single-cable communication system
- single-cable system
- single-channel system
- single-current transmission system
- single-pulse tracking system
- Skynet system
- small-grained communication system
- SmarTrunk II radio communication system
- solid-state uninterruptible power battery system
- Sony bus system
- sound alarm system
- sound equalization system
- sound navigation system
- sound reinforcement system
- sound warning system
- space-division system
- space-switched system
- spark-safe system
- speaker system
- special communication system
- speech-processing system
- speech-recognition system
- split-speaker system
- spread-spectrum system
- stabilizing system
- stage monitoring system
- standalone double point system
- star-circuit system
- STAREX CMX system
- starting communication system
- start-stop system
- stationary satellite system
- step-by-step system
- stereo sound system
- stereophonic sound system
- storage system
- storage-and-retrieval system
- Strowger system
- submarine fiber-optic system
- subprimary digital transmission system
- subscriber carrier system
- subscriber switching system
- suffix system
- Supersat system
- supervisory control system
- surround sound system
- switched telecommunication system
- switching system
- sync communication system
- synchro system
- synchronous communication system
- synchronous digital system
- TAGS system
- tandem system
- tariffication system
- T-carrier system
- TDF system
- teleautomatic system
- Telecom system
- telecommunication system
- telecommunications system
- telecommunication-service priority system
- telecommunications-service priority system
- telecontrol system
- telemechanic system
- telemetering system
- telemetry system
- telephone system
- telephone-answering system
- telephone-communication system
- telephone-communications system
- teleprocessing system
- Telesat system
- teletex system
- teletypewriter system
- television-telephone system
- Tele-X system
- Telsar system
- terminal system
- terrestrial radio-relay system
- theft-prevention system
- thin-route system
- third generation communication system
- three-axle stabilizing system
- three-channel HF-telephone system
- three-channel transmission system
- three-color system
- three-lens optical system
- three-primary system
- three-wire system
- time-dissemination system
- time-frequency hopping system
- time-switched system
- total access communication system
- total area coverage system
- transmission system
- trichromatic system
- triple-interlace system
- triplex system
- trunk communication system
- TV-observation system
- twelve-channel transmission system
- two-arm system
- two-band system
- two-color system
- two-roller transfer system
- two-step control system
- two-way CATV system
- two-way system
- two-wire telephone communication system
- ultra-match system
- ULTRIX system
- unified radioaccess system
- unilateral-control system
- unilateral-synchronization system
- uninterruptible-power system
- Unisat system
- universal alarm system
- universal-battery system
- universal-electronic system
- universal-movable system
- Uniworks system
- vestigial-sideband system
- video editing system
- video home system
- video recording system
- videocom system
- videoteleconference system
- videotex system
- virtual studio system
- vision system
- vocoder system
- voice dialog system
- voice frequency carrier telegraph system
- voice modulation system
- voice post system
- volume control system
- waiting system
- warning system
- watch system
- watching system
- waterside facsimile communication system
- wave-propagating system
- wide-angle TV system
- Winfax Pro system
- wired broadcasting system
- wireless CCTV system
- wireless home system
- wireless infrared speaker system
- wire-radio communication system
- XY system
- zone-selective protection system
- zoning system