OpenBSC, a complete GSM network side implementation, including BSC, MSC, HLR, implemets A-bis and A protocols of GSM network

OpenBSC（BSC/MSC/HLR） 是一个开源的基站控制器（Base Station Controller），部分实现了 A-bis （包含 BSC/MSC/HLR） 协议，以及 GSM 技术规范 08.5x 和 12.21。-It started as a BSC (Base Station Controller) side implementation of the A-bis protocol, as implemented

OpenBSC implements several MSC components, including the A-bis protocol (the protocol between the BTS and the BSC), AUC, HLR, VLR (both using SQL tables), and a SMS Switching Center. OpenBSC can be accessed using telnet.