Proolin voip iad / pl-311 voice gateway is an internet based one port voice gateway. Pl-311 adapts multi voice control protocols and voice compression codec to directly convert analog voice into ip packet for internet transport Pl-311 one port voice gateway supports sip protocols, offers two 10/100mbps ethernet interface , one rj11 telephone interface and one fxo port. Therefore, the original analog telephone can dial ip phone , it is compatible with various ippbx and voip voice gateway to provide broadband ip voice service
