VIACOM does support the radios via the menu, you need to say the word "Options", and the radio menu will turn on, but you need to press the viacom radio key for the radio you want to use. Menu will pop up with that radio listed at the top, works for intercom also. Once the menu is up, say "Take X" where x is the number of function you want to communicate.
Options, Take 8, Take 2, Take 1. You just had the crew chief turn on electrical power.