ES600 series IP smart phones are a new generation of intelligent desktop terminals, featuring stylish design, clear voice, and rich function keys. They support multiple line registrations, simultaneous management of multiple calls, call waiting and queuing, and convenient creation of conference calls and call transfers. They support 6 expansion modules with a total of 192 programmable keys, meeting the needs of telephone operators. They provide a professional headset microphone interface, suitable for call center applications.