
1) Intercom 2) Intercommunication system
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https://www.crosswordclues.com/clue/interphone

[
n] - a telephonic intercommunication system linking different rooms in a building or ship etc
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http://www.webdictionary.co.uk/definition.php?query=interphone

interphone A telephone system (as in an airplane, tank, ship, or office building) for intercommunication between points within a small area. Related 'together' units: com-; greg-; struct-. Cross references of word families related directly, or indirectly, to: 'internal organs, entrails,...
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noun a telephonic intercommunication system linking different rooms in a building or ship etc
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https://www.encyclo.co.uk/local/20974

Leading multinational study into mobile phones and cancer, with research teams in 13 countries. Coordinated by IARC
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https://www.encyclo.co.uk/local/21593

an intercommunication system using telephones to connect offices, stations, etc., as in a building or ship; intercom. · a telephone used in such a system.
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https://www.infoplease.com/dictionary/interphone
No exact match found.