Dr. Firestone and Dr. Grey messages on the Simplex voice evacuation system

I was watching this video on all the tones and messages of the Simplex voice evacuation systems ([https://www.youtube.com/watch?v=NSbfgEOwVaY]), there were two messages that really stood out and I don’t know what they mean.

1st message: “Dr. Firestone, please dial 2829.”
2nd message: “Dr. Grey, please dial 2353.”

(I just realized I put this thread in the wrong topic. If anyone knows how to move topics, please let me know.)

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Not sure what “Dr. Grey” indicates (though it’s probably referring to a hospital code with that color), but “Dr. Firestone” is another way of saying “Code Red”, which is the hospital code word for fire.

Maybe “ dr gray “ means gray alert

According to Wikipedia “Code Gray” means:
“combative person (combative or abusive behavior by patients, families, visitors, staff or physicians); if a weapon is involved code silver should be called”

And the reason for the “ dr gray “ message is so the combative person doesn’t flee the scene

Well yeah, that’s the point of any hospital emergency code: to inform those with knowledge of what they mean of an incident without frightening those who don’t.