correct as is Voice chat in UH and Hind: PTT transmits both: selected radio AND Intercom.

[Tarres]

When press the PTT (radio 1), both boxes are marked red, so selected radio and Intercom are transmitting.

Intercom PTT works as intended. Only Intercom box is marked red and transmit.

Attached screenshot.

[Flappie]

Hi @Tarres. Devs told me it was correct as is, since you can indeed hear your crewmate in your headphone while he/she is talking though the radio.

[MAXsenna]

They Huey has the Intercom key on the first stage trigger on the cyclic. The radio is keyed by the second stage trigger.
I assume you'd want your co-pilot to hear your transmissions.

Cheers!