Outgoing calls cann`t be made
5.1 Outgoing calls can`t be made
1). Programmed to be in no CO line mode;
2). Call restriction class is 6;
3). CO line is set to special Extension;
4). Extension hung up improperly;
5). CPU and internal data is disorder caused by unstable power.
If all external
indicator LED
flash?
If EXT. is set
to class 6 ?
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
Chapter 5 Maintenance & Troubleshooting