List of Abbreviations
| 3GPP | Third Generation Partnership Project |
| 3GPP2 | Third Generation Partnership Project 2 |
| A RR | IPv4 Address Resource Record |
| AAA | Authentication, Authorization and Accounting |
| AAAA RR | IPv6 Address Resource Record |
| AAL | ATM Adaptation Layer |
| AAR | AA-Request |
| ACA | Accounting Answer |
| ACK | Acknowledgement |
| ACL | Access Control List |
| ACR | Accounting Request |
| ADSL | Asynchronous Digital Subscriber Line |
| AH | Authentication Header |
| AKA | Authentication and Key Agreement |
| ALG | Application Level Gateway |
| AMR | Adaptive Multi-Rate |
| AMR-WB | Adaptive Multi-Rate Wideband |
| ANM | ISUP Answer Message |
| AOR | Address Of Record |
| API | Application Programming Interface |
| APN | Access Point Name |
| ARIB | Association of Radio Industries and Businesses (Japan) |
| AS | Application Server |
| ASA | Abort-Session-Answer |
| ASR | Abort-Session-Request |
| ATA | Analog Terminal Adapter |
| ATM | Asynchronous Transfer Mode |
| AUC | AUthentication Centre |
| AUID | Application Usage ID |
| AUTN | Authentication token |
| AUTS | Synchronization token |
| AV | Authentication Vector |
| AVP | Attribute Value Pair |
| AVP | Audio Video Profile |
| AVPF | RTP Audio-Visual Profile with Feedback |
| B2BUA | Back to Back UA |
| BCF | Bearer Charging Function |
| BER | Bit Error Ratio |
| BFCP | Binary Floor Control Protocol |
| BGCF | Breakout Gateway Control Function |
| BICC | Bearer Independent Call Control |
| BNF | Backus-Naur Form grammar |
| BS | Bearer Bervice; Billing System |
| BSF | Bootstrapping Server Function |
| BTS | Base Transceiver Station |
| CA | Certificate Authority |
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