Override codes don’t work if Cerberus’ mic is shut off

Danielle came running over. He opened his mouth to talk but she waved him silent. “Echo sierra alpha victor forty-two,” she called out.
The battlesuit slammed its mangled hand against the ground and pushed up. The servos whined. The damaged hand sparked on the pavestone walkway.
She frowned. “Echo! Sierra! Alpha! Victor! Forty-Two!”
The armored titan got to its hands and knees, then brought one foot up.
Danielle called out the words one more time and punctuated the phrase with a swear. “God****it,” she added. “He killed the external mikes. I can’t shut it down.”

Excerpt From Ex-Purgatory, pg 607
Peter Clines
https://books.apple.com/us/book/ex-purgatory/id676938479