A locked intercom button is a customer option on both makes
Thanks, that makes sense. I've bumped almost every switch and button over the years but I just couldn't remember that one. And, there may be a little switch to lock on the interphone on the comm selector panel, seems like I've used hot mike in the sim with googles and masks on. Anyway, I've never seen much use of interphone in the cockpit in recent years at the few places I've worked.
There was the old trick of putting the FE on O2, and convincing a new flight attendant to come up to the cockpit to talk with the space shuttle (played by the FE on intephone through the mask). Don't think I'd try that one in these politically correct post-911 times. Of course, it's getting hard to find FE's as well...
The only audio switch I use on the yoke is a rocker switch with the top part for radio and the bottom part for interphone. Or, is it the other way around, I never could remember.
