2019 California Standards for Accessible Design Guide (effective January 1, 2020 with July 1, 2021 amendments)

11B-407.4.9 Emergency communication.

Emergency two-way communication systems shall comply with Section 11B-308. Raised symbols or characters, white on a black background, and Braille shall be provided adjacent to the device and shall comply with Sections 11B-703.2 and 11B-703.3. Emergency two-way communication systems between the elevator and a point outside the hoistway shall comply with ASME A17.1.

[2010 ADA Standards] 407.4.9 Emergency Communication. Emergency two-way communication systems shall comply with 308. Tactile symbols and Characters shall be provided adjacent to the device and shall comply with 703.2.