1,5 line voip sip phone 2, 5 sip registration 3,3 way conference call 4,IP Assignment: DHCP, ... static IP 5,support PPPOE Skyline 5 Line Voip Phone(sip& ... H.323)Overview Function1,support 5 sip accounts2,support 3 way conference call3,support ... at your Local office,you could dial & receive phone call from your customers as you are there ...