The NetVanta 6250 Series is designed for converged voice-data services. This includes legacy T1 access and Ethernet delivery. It uses SIP or MGCP to deliver VoIP applications and interoperability with industry-leading soft switch, servers, gateways, and gateways. These devices act as gateways and convert IP signaling from the carrier to traditional TDM analog or digital voice services. This functionality allows the NetVanta 6250 Series of devices to simultaneously provide voice services to traditional telephony equipment and IP phones. All NetVanta 6250 devices have one Gigabit combo port to copper or fiber delivery, four Fast Ethernet port ports for WAN or LAN access, a USB Port for wireless backup or storage, as well as four Fast Ethernet ports. There are also four Fast Ethernet ports for WAN or LAN access, four Fast Ethernet ports to support both WAN and LAN access, a USB port, and four T1 ports that can be used for legacy PBX connections. Additional software upgrades are possible to add SBC functionality, VPN, voice quality monitoring (VQM), and a graphically intuitive interface that displays captured data for mean opinions score (MOS).