2010 ADA Standards for Accessible Design Pocket Guide
703.7.2.3 Volume Control Telephones.
Telephones with a volume control shall be identified by a pictogram of a telephone handset with radiating sound waves on a square field such as shown in Figure 703.7.2.3. [S.H. 4.30.7(2)]
Figure 703.7.2.3 Volume Control Telephone
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