The Siemens Optipint 500 Standard similar also to the HiPath Basic allowing digital communication but is full-featured, with full-duplex speakerphone for users requiring to multitask while on the telephone.The Siemens optiPoint 500 Standard also offers USB connectivity for CTI connections. Key Features 12 function keys Hands-free - fully duplex with echo suppression LCD Display optiGuide navigation keys Connection port for add-on equipment/adapter USB interface