Proolin  VoIP Gateway / PL-401 Gateway is an internet based voice network phone terminal. PHONE series IP phone adapter multiple voice control protocols and voice compression coding methods to directly convert analog voice into IP packet for internet transport, thus effectively using the existing bandwidth to provide PSTN quality voice service.         PL-401 Gateway supports IAX2,SIP,protocols,Support Bridge and Router model.Support IAX2 and dual public server, offers Two Ethernet interface and is compatible with various softswitch systems and VoIP voice gateways to provide broadband IP voice service.