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Older emergency vehicle sirens had that feature, I remember Federal sirens having this feature..  It directed your radio through the PA speaker so you can hear it when you are out of the vehicle.  Some CBs copied this feature, Cybernet radios have it,  It says EXT CB on older Midlands.  I can imagine the modern Facebook, Twitter folk back in the day not wanting to miss a CB call while at a field party.  I can imagine pulling up to the party in my 78' Nova switching on the EXT CB switch and yelling to my friends, "I'm expecting a call if you all here someone call for Secret Squirrel give me a yell.!"