Warning sounds at office centre... actual weapons (4,6)

I believe the answer is:

fire alarms

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'warning sounds' is the definition.
The definition and answer can be both related to communication as well as being plural nouns.
Maybe you can see an association between them that I don't see?

'office centre actual weapons' is the wordplay.
'centre' indicates the central letters.
'actual' becomes 'real' (synonyms).
'weapons' becomes 'arms' ('arm' can be a synonym of 'weapon').
The middle letters of 'office' are 'fi'.
'fi'+'real'+'arms'='FIRE-ALARMS'

'at' acts as a link.

Can you help me to learn more?

(Other definitions for fire alarms that I've seen before include "Warning devices" , "They warn of danger" .)

I've seen this clue in the Sydney Morning Herald.

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