NEC DT900 Series - The Phone Cannot Make any Calls; The Phone Cannot Make any External Calls

. . . . .
CALLING
DT900/DT900S Series Phone User Guide 11-161
this information is missing, there may be a problem with your connection to the
network. Contact your system administrator.
4 Restart the phone:
a. Press the Menu key.
b. Select 5 Reboot.
c. Press the OK softkey or b Enter key on the cursor pad to restart the phone.
Note:
If you cannot restart the phone using the Menus, unplug the phone from power
and the network for ten seconds, then reconnect the telephone to your
network and power to perform a
restart.
5 If you are still having problems with your phone, contact your system administrator.
The phone cannot make any calls
1 If you are using a headset, try using the phone handset to make a telephone call. If the
phone works while using the handset but not your headset, replace the headset you
have attached to the phone.
2 Press the Menu key, then go to 6 Status, 2 Network Information and verify that the
phone has an IP address, Subnet Mask, Default Gateway, and DNS Server listed. If any of
this information is missing, there may be a problem with your connection to the
network. Contact your system administrator.
3 Restart the phone:
a. Press the Menu key.
b. Select 5 Reboot.
c. Press the OK softkey or b Enter key on the cursor pad to restart the phone.
Note:
If you cannot restart the phone using the Menus, unplug the phone from power
and the network for ten seconds, then reconnect the telephone to your
network and power to perform a
restart.
4 If you are still having problems with your phone, contact your system administrator.
The phone cannot make any external calls
1 In your network requires and outside access code to reach an outside telephone line,
make sure you enter that as the first number when you are dialing an outside line.
2 Verify that your network is not having problems accessing outside telephone service.
3 Contact your system administrator to verify that your account is authorized to call
external numbers.
4 Press the Menu key, then go to 6 Status, 2 Network Information and verify that the
phone has an IP address, Subnet Mask, Default Gateway, and DNS Server listed. If any of
this information is missing, there may be a problem with your connection to the
network. Contact your system administrator.
5 Restart the phone:
a. Press the Menu key.
b. Select 5 Reboot.
c. Press the OK softkey or b Enter key on the cursor pad to restart the phone.
Note:
If you cannot restart the phone using the Menus, unplug the phone from power
and the network for ten seconds, then reconnect the telephone to your
network and power to perform a
restart.
6 If you are still having problems with your phone, contact your system administrator.