4 Fxs Portsfully Compliant With Sip And Iax2flexible Calling Rulesreliable Fax Performance With T.38provides Highquality Voice Compression With Industry Standard Codecsline Echo Cancellation For 32 64 Or 128 Ms Echo Delayswebbased Gui For Easy Configuration And Managementexcellent Interoperability With A Wide Range Of Legacy And Ip Equipment