List of Abbreviations
| 1×RTT | Single carrier radio transmission technology |
| 3GPP | Third generation partnership project |
| 3GPP2 | Third generation partnership project 2 |
| AAA | Authentication, authorization and accounting |
| AAL | ATM adaptation layer |
| AAR | AA request |
| ACA | Accounting answer |
| ACK | Acknowledgement |
| ACR | Accounting request |
| AGCF | Access gateway control function |
| A-GNSS | Assisted global navigation satellite system |
| AGW | Access gateway |
| AKA | Authentication and key agreement |
| ALG | Application level gateway |
| AMR | Adaptive multi-rate |
| AMR-WB | Adaptive multi-rate wideband |
| AOC | Advice of charge |
| AP | Authentication proxy |
| APN | Access point name |
| APN-AMBR | Access point name–aggregate maximum bit rate |
| ARP | Allocation and retention priority |
| AS | Application server |
| ASA | Abort session answer |
| ASR | Abort session request |
| ATCF | Access transfer control function |
| ATGW | Access transfer gateway |
| ATM | Asynchronous transfer mode |
| AUC | Authentication centre |
| AUID | Application usage identification |
| AUTN | Authentication token |
| AVC | Advanced video coding |
| AVP | Attribute value pair; audio visual profile |
| AVPF | Audio visual profile with feedback |
| B2BUA | Back to back user agent |
| BGCF | Breakout gateway control function |
| BICC | Bearer independent call control |
| BS | Billing system |
| BSC | Base station controller |
| BSS | Base station system |
| BTS | Base transceiver station |
| CAT | Customized alerting tone |
| CB | Communication barring |
| CCBS | Completion of communications to busy subscriber |
| CCF | Charging collection ... |
