The X3SP-Pro is an entry-level color screen IP Phone. With high-definition voice, 320x240 2.4-inch color main screen, 4 SIP lines, local 6-party conference call, and other extended features like EHS headset, it provides a high-quality and convenient experience for users at an affordable price. Built-in line keys can be adjusted as DSS keys according to the requirements of the configuration to achieve application functions. Each DSS key can be set to LINE /BLF/ speed-dial extension which can be triggered by one click after configuring the change function. The Fanvil X3SP Pro IP Phone is compliant with SIP protocols and is therefore widely compatible with major professional platforms including Asterisk, Broadsoft, 3CX, Metaswitch, Elastix, and Avaya, etc.