Solution
If your machine is connected through a PBX (Private Branch Exchange), it is necessary to set the access method. If you register the outside line access number in the R-key, you can easily access the outside line.
1. Press

[Menu].
2. Press [

] or [

] to select <SYSTEM SETTINGS>, then press [OK].
If the System Password has been set, enter the System Password using

-

[numeric keys], then press [OK].
3. Press [

] or [

] to select <COMMUNICATIONS>, then press [OK].
4. Press [

] or [

] to select <R-KEY SETTINGS>, then press [OK].
5. Press [

] or [

] to select <PSTN> or <PBX>.
- <PSTN>: Select if your machine is connected to an outside line. If you select <PSTN>, press [OK], then go to step 7.
- <PBX>: Select if your machine is connected through a PBX. If you select <PBX>, press [OK], then go to the next step.
6. Enter the prefix code (up to 20 digits) using

-

[numeric keys], then press [OK].
7. Press

[Stop/Reset] to return to the standby mode.