Usage Note
Interphone is the standard French word for an intercom system, especially the door-entry device in apartment buildings (what British English calls a 'door entry phone' or 'entryphone'). It is distinct from téléphone intérieur (internal telephone). Pressing sonner à l'interphone means ringing the building's intercom buzzer.
Examples
"Elle a répondu à l'interphone sans ouvrir la porte."
Natural Translation
She answered the intercom without opening the door.

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