1. 【CALLER ID】This corded call center keypad phone features an intelligent backlit display for incoming calls, automatic time synchronization for incoming calls, and automatic line pickup when busy. Incoming FSK or DTMF calls are automatically identified and decoded. 2. 【CORD CONTROL SUPPORT】The corded call center keypad phone supports automatic answering of incoming calls, as well as external cord control for headsets to answer and hang up calls. 3. 【CALL INQUIRY】The call center phone supports 66 groups of 16-bit incoming call inquiries and 20 groups of 16-bit outgoing call inquiries. Enjoy high-definition voice calls and check caller ID during the call. 4. 【MUTE MODE SUPPORT】This corded call center keypad phone features an external ringtone and a selectable built-in ringtone, along with support for mute mode with status display on the screen. 5. 【HEADSET INTERFACE】The corded call center keypad phone with headset offers two headset interfaces on the left and right sides, allowing you to choose which side to use for training purposes or other scenarios. 6. 【EXTERNAL DEVICE SUPPORT】The corded keypad phone includes an external connection interface that can be connected to an external telephone extension or recording device. The headset holder can be freely positioned on the left or right side of the slot.