2019 California Standards for Accessible Design Guide (effective January 1, 2020 with July 1, 2021 amendments)
11B-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 11B-703.7.2.3.
FIGURE 11B-703.7.2.3 VOLUME CONTROL TELEPHONE
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