The NetVanta 6310 and Modular IP Business Gateway is designed for use in integrated IP voice and data service offering to small-to-medium sized businesses, worldwide. This powerful solution combines the robust routing and voice features of ADTRAN's industry-leading Total Access 900e Series of IP Business Gateways into a modular, multi-function chassis with a variety of network and voice interface modules to enable cost-effective IP-based services over a converged services infrastructure. With this versatile chassis, carriers can offer a variety of services including cost-effective integrated voice and data over an Ethernet-fed Wide Area Network (WAN) or over low overhead bonded e.SHDSL loops and T1 circuits. The dual-slot chassis includes a robust IP router, SIP gateway, integral PRI/PRA T1/E1 for PBX connectivity, and dual 10/100Base-T Ethernet interfaces for routing, DMZ, or Ethernet-fed WAN applications.