©2001 Nokia Mobile Phones. All rights reserved. 54AbbreviationsAbbreviation DescriptionAAC Automatic Area CodeAC Alternating CurrentCLI Calling Line IdentificationDC Direct CurrentDTMF Dual Tone Multi FrequencyEFR Enhanced Full RateETSI European TelecommunicationsStandards InstituteFSK Frequency Shifting KeyingFR Full RateGSM Global System MobileHR Half RateHSCSD High Speed Circuit Switched DataIOF Intensity of FieldMO Mobile OriginatedMT Mobile TerminatedPBX Private Branch ExchangePC Personal ComputerPIN Personal Identification NumberPSTN Public Switched Telephone NetworkPUK PIN Unblocking KeySIM Subscriber Identity ModuleSMS Short Message Service
