I seem to recall they were hooked up with some rubber things to comms posts along the Northern parallel taxiway,
Telescramble - aka Bomber Box. There would be a Bomber Box in the sqn dispersal, in ATC and probably in Ops as well. In the late 60s this was an 8-line output from Bomber/Strike Commands WW2 bunker and then split into two 4-set up the country with pairs into each dispersal. Coninuously live with regular (one minute IIRC) confidence pips.
A similar system, Telebrief, served the fighter airfields but this was from the SOCs.