... service Anonymous call, Direct IP Call and Busy tone Fax over IP and Three –way conferences Multiple FXS ports ... reliabilityAdministrator authentication mechanism is used to ensure that information and data are secured.Protocols supportedDAG 2000(32FXS) supports SIP 1. ... waiting, Call display etc standard voice service and Busy tone, Fax over IP, Three-way conference . Support PPPoE client , ensure ...