After reading numerous manuals etc i can't find how to change the time on my siemens optipoint 500 land line phone!! It gathers time over the year and is at the moment 5mins infront of he actual time, I have rung Siemens but they won't help as i don't have a service contract with them!! The Siemens OptiPoint 500 offer a large range of system phones. From the Entry phone without LCD, to the Advanced phone with 19 programmable keys, LCD and Speakerphone The Siemens optiPoint 500 Standard is a full duplex handsfree phone designed to provide rapid and easy access to your Hi Siemens - Acuson X500The Acuson X500 ultrasound unit is the ultimate imaging device to provide accurate diagnosis to patients across a broad range of clinical Versatile and ergonomic, the Siemens Acuson X500 ultrasound system features advanced volumetric imaging functions and excellent clinical