Abbreviations and Acronyms

A3: Authentication algorithm A3
A38: Single algorithm performing the functions of A3 and A8
A5/1: Encryption algorithm A5/1
A5/2: Encryption algorithm A5/2
A5/X: Encryption algorithm A5/0-7
A8: Ciphering key generating algorithm A8
AA19: Standard GSM contract between two operators for the charging of the SMS-MT sent to their own subscribers by the other
AB: Access burst
AC: Access class (CO to C15); application context
ACC: Automatic congestion control
ACCH: Associated control channel
ACK: Acknowledgment
ACM: Accumulated call meter (a zone of a SIM card); Address complete message (response to an ISUP call setup)
ACMmax: Maximum of the accumulated call meter
ACSE: Association control service element
ACU: Antenna combining unit
ADC: Administration center; analog-to-digital converter
ADN: Abbreviated dialing number
ADPCM: Adaptive differential pulse code modulation
AE: Application entity
AEC: Acoustic echo control
AEF: Additional elementary functions
AGCH: Access grant channel
AI: Action indicator
AMPS: Advanced Mobile Phone System; analog mobile radio system
ANSI: American National Standards Institute
AoC: Advice of charge
AoCC: Advice of charge charging supplementary service
AoCI: Advice of charge information supplementary service
AP: Application part
APLMN: Associated public land mobile network
AS: Affiliate server (SIGTRAN)
ASE: Application service element
ASN.1: Abstract Syntax Notation One
ARFCN: Absolute radio-frequency channel number
ARQ: Automatic request for retransmission
ASP: Application service provider (content provider for Internet services); application server (SIGTRAN)
ATT(flag): Attach
AU: Access unit
AuC: Authentication center
AUT(H): Authentication

BA: BCCH allocation
BAIC: Barring of all incoming calls supplementary service
BAOC: Barring of all outgoing calls supplementary service
BCC

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