For the NEC DSX DTL-8R-1, try pressing and holding the Volume Down button on the handset for 2+ seconds while the phone is in standby mode. This press and hold option toggles the Ringer Mute feature. It works when an incoming call is ringing or in standby.
The manual for the this phone is available online here: http://www.teamextenda.com/download/nec/NEC_DSX_Cordless_DECT_UserGuide.pdf .
I hope this helps.
Cindy Wells
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