FANVIL X3SW - 4 SIP LINE WI-FI IP PHONE 4 SIP lines, SIP hotspot 1000 local phonebook, caller ID, call hold, call transfer 2.4” main color display HD audio on speakerphone and handset Opus voice: can handle a variety of audio applications, including IP voice, Multiparty conference, etc. Support 6-party local conference Support EHS wireless headset Built-in 2.4GHz WiFi, supporting wireless network connection. Dual Fast ports Stand with 2 adjustable angles of 45 and 50 degrees Compatible with major platforms: Asterisk, Broadsoft, 3CX, Metaswitch, Elastix, Avaya etc.