1873 11 Oct. 462/2 A number of little tubes..are laid from the pneumatic communication-room (also the telegraph room) to Fenchurch Street.
1942 17 Dec. 10/3 Forty messages came through the communication room from the wardens in the two zones and the operators were on the alert.
2007 (Nexis) 17 July 18 The 15,500 monthly total of 999s managed by the [police] force's communication rooms.