intercom; intercommunication system
Technical term for an intercom system, especially in aircraft or similar enclosed environments. Often replaced by the loanword インターコム in casual contexts.
See also: インターコム
The pilot gave instructions to the cabin crew via the intercom.
Common loanword for intercom; more widely used in everyday contexts, while 機内通話装置 is a formal technical term.
Compound of 機内 (in the aircraft) + 通話 (communication) + 装置 (device).