Siemens OptiPoint 500 Standard ML Telephone (White/Refurbished)OptiPoint 500 Standard ML Telephone The OptiPoint 500 Standard phone is a full featured, digital telephone with a full duplex speakerphone for power users and areas where call coverage is required. Key Features: Mnfr Part #: 69906 Full Duplex Multi Line Telephone LED Display 12 keys with LEDs (to indicate line or feature status) Handset Compatible Integrated USB jack (for low cost CTI connections without the need for additional modules or adapters