Audio program step feature
From Zenitel Wiki
| Feature: | Audio Program Step |
| Default directory number: | 790 - 791 |
| Feature number: | 4 |
| Parameter 1: | 0 = Step to next program 1 = Step to previous program |
| Description: | Step through list of programs including program OFF. If used after 800 or C, previous program is restored. See Audio Program Step |