VoIP phone 1.Sip support 2 simultaneous SIP lines or 1 ... ZP302 IP PHONE With 2 SIP or 1 IAX2: ZP302 VoIP Phone is an entry level desktopphone terminal which adopts SIP ... Platforms such as Asterisk, FreePBX, Broadsoft, Cisco call manager etc. VOIP:SIP 2.0 (RFC3261) and correlative RFCs..Full duplex hands ...