... 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, ... Switched ModeTelephony FeaturesCaller ID display or block, Call waiting, Blind or attended call transfer, Call forward, Do not disturbQosDiff Serve, TOS ...