Samsung SF-5800 - Manual (Page 29)

Adjusting Speaker Volume
1. Press OHD to adjust the speaker volume. If you cannot hear dial
tone, check the phone line connection.
2. Press
¹ or repeatedly until you find the desired loudness (0~7).
The display shows the current volume level.
3. After choosing the desired volume level, press OHD .
1.20
Set Up Your Machine