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* Programmed to be in no CO line mode;
* Call restriction class is 6;
* CO line is set to special Extension;
* Extension hung up improperly;
* CPU and internal data is disorder caused by unstable power.
6.1 OUTGOING CALLS CAN`T BE MADE
6 MAINTENANCE & TROUBLE SHOOTING
If all external
indicator LED
flash?
All extensions cann`t
make outgoing calls?
Trouble exists?
Trouble exist?
Change extension class
One of extension
hung up improperly
Cancel the
setting
Voltage not stable or
magnetic disturbance
Using a UPS and avoid
from disturbance
Avoid the distrubance
Contact local dealer
Yes
Yes
Yes
Yes
Yes
No
The CO line is set to
special Extension?
Check again after shutting
off for one minute.
Yes
No
No
No
No
NO
If EXT. is set to class 6 ?