... , can be achieved with many other SIP compliant devices and software interoperability. In addition, it supports including G.723.1, PCMA ... voice service Anonymous call, Direct IP Call and Busy tone Fax over IP and Three –way conferences Multiple FXS ports optionalDAG ... waiting, Call display etc standard voice service and Busy tone, Fax over IP, Three-way conference . Support PPPoE client , ensure voice ...