SL1100 latest software version: Just installed DTZ-8R-1 (3 of them) and had several issues: Severe echo. After doing analog side tone calibration it was much better and now I see a procedure from NTAC to reduce echo by lowering gain of the handset...will try that tomorrow. 2nd issue: This is really annoying. After talking for awhile the display goes off (or dim) and when the call is completed pressing the END button doesnt hang up the line it only restores the display then you have to END again. Any way around this? After I left I wondered if the LCD timeout in programming would affect this? The MENU timeout option on the handset has no effect on this.