... is highly integrated router, NAT, phone gateway functionality and has market-leading voice quality, rich functionality, and lightweight, compact design ... 729AB voice codec. Suitable for carrier and enterprise VoIP call center agents.DAG 2000(32FXS)can be with the mainstream ... supports SIP 1.0/2.0.Main featuresSupport Call forwarding, Call waiting, Call display etc standard voice service and Busy tone, ...