VoIP phone Sip support 2 simultaneous SIP lines or 1 IAX2 line Support phonebook 500 records Superior quality and competiti VoIP phoneZP302--Enter level ip phone .74*28mm character LCD .SIP 2.0 (RFC3261), 2 lines .G.711 A/U Law, G.722, G.723, G.729 .Rich call control features .G.168 Echo cancellation and VAD,CNG .Full duplex hands-free speaker .Support SRTP .Support basic NAT and NAPT .Support ...