... realize flow media conversion between the IP and PSTN.Large port access gateway Standard SIP protocols Standard G.723.1,G ... .711 bypassDHCP Client/ServerNAT Router or Switched ModeTelephony FeaturesCaller ID display or block, Call waiting, Blind or attended call transfer, Call ... ,BT,NTT, and, DTMF-based CIDPolarity ReversalYesHomologationSafetyULComplianceFCC,CE Dinstar 32 Port FXS SIP ATA Gateway