Fanvil Enterprise IP Phone X4 4 SIP Line PoE Capable and 2.8″ Color Screen
IP phones are wired using Ethernet cables and connect to an IP-based phone system, whereas traditional desk phones use an analog cable and typically connect to analog or legacy digital phone systems. What allows IP phones to be so powerful is that they use an Internet protocol called SIP (Session Initiation Protocol) to send and receive audio.