MSAP2000 is a newly designed NG DLC with a modular architecture. The system capacity is expansible from 16 to 2,000 POTS lines by adding new modules or expansion shelves into the system. Furthermore, MSAP2000 can be configured to be a gateway of Voice over IP with SIP, H.248 protocol. By adding the plug-in module of Packet Voice Module (PVM), MSAP2000 can be directly connected to softswitch through the Ethernet link.