PST is a provider of products and services such as video camera inspection services,encoded magnetic card systems,software, interactive voice response (ivr),software, computer telephony integration (cti),software, computer hardware testing and maintenance,software, communications network management,smart cards, contactless,chip cards,smart cards, contact,fidelity cards,voice recording and playback cards,optical cards,integrated circuit (ic) card systems, multifunctional,subscriber identification module (sim) cards,telephone accounting and billing systems,telephone conversation recording machines,telephone ringing machines,call announcers for telephones,telephone announcement systems, recorded,information systems, telephone, voice activated,hotel communication systems, complete,teleloop systems, transmitter to hearing aid,vehicle location systems, automatic,communication equipment, telephonic, for lifts,security encryption equipment, telecommunication systems,telephone equipment for the disabled,telephone conference telecommunication equipment,data communication systems, base to taxi,call centre management systems,call distributors,telex equipment,telecommunication terminals,emergency telephones, portable, gps/gsm,telephones, feature and novelty,telephones with electric generator,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 systems, wireless, indoor,telephone intercommunication equipment, aircrew,telephone intercommunication equipment, marine, shipborne,telephone intercommunication equipment, sub-sea,telephone intercommunication equipment, industrial,telephone intercommunication equipment, flameproof,telephone intercommunication equipment, loudspeaker type,telephone intercommunication equipment, push-button types,telephone intercommunication equipment, direct speech,telephones, voice over internet protocol (voip),internet telephones,text telephones,telephones, amplified,tickets, magnetic track,telemetry equipment,videophones,alarm centres, automatic,prisoner-to-warder call systems, prison complexes,patient-to-nurse call systems, hospital,warden call systems for old peoples homes.