Receive the new CO/PBX dial tone.
3.
Dial the desired number.
To use the Drop Key feature from a single line telephone with a CO/PBX call in progress:
1.
Hookflash.
2.
Receive internal dial tone.
3.
Dial the Service Code (Program 11-12-59, default not assigned).
4.
Receive the new CO/PBX dial tone.
5.
Dial the desired number.
427