This word is acceptable for play in the UK dictionary that is being used in the following games:

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n. A telephone used in a small closed system of telephones: "The sergeant lifted the interphone and told the pilot that the door was properly sealed” ( Tom Clancy).

n. a telephonic intercommunication system linking different rooms in a building or ship etc

"There's an international study called the interphone study that is starting to get some data back looking at several different countries, and they are finding a slightly higher brain tumor risk with people who use cell phones."

intercom    intercommunication system   

interphase    interpose   

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