Denwa Communications DW-820 User Manual page 108

 Please check whether the adapter fits this product requirement;
 Please check whether the outlet is working properly.
Failure 2: No voice when pick up the handset
 Please check whether the connection of handset is working properly;
 Please adjust the volume + key on keyboard when off-hook the phone, Observe
the display of "volume" prompt. Please pay attention that the volume key in
on-hook and off-hook situation is to adjust the ring volume and media volume
(call volume) separately. These two adjustments are unrelated. Adjust the
volume won't change call volume when on-hook the phone.
Failure 3: Phone can't dial properly
 Please check whether there is
check whether the cable in LAN port is loose;
 Please check the IP address of phone via configuration (go to 4.2, "network
configuration");
 If it's now in LAN, please check whether the IP address of phone is conflict with
other devices in the same LAN.
 If the network connection is properly, please check whether the icon
successful registration is in the notification area. If there is no explanation of
configuration failure, please contact network administrator to recover it.
Failure 4: No ringing when incoming a call
 Please make sure the handset is completely hung on the base

Please adjust the volume + key on keyboard when on-hook the phone, Observe
the display of "volume" prompt. Please pay attention that the volume key in
on-hook and off-hook situation is to adjust the ring volume and media volume
(call volume) separately. These two adjustments are unrelated. Adjust the
volume won't change ring volume when off-hook the phone.
at the top-right of screen. If not, please
of