Basically it is that Mumble = Talking and In Game VoIP = radio.
Here are the two simple ramifications:
1. When using your radio (in-game) you automatically transmit on mumble. People around you if close enough can hear you talking to your squad mates over the radio. I also think the volume should be somewhat lower to simulate someone talking quieter into their radio.
2. The enemy should either be able to hear you talking or using your radio though mumble . I don't think they should necessarily be able to understand you to simulate language barriers but I do think they should be able to hear the direction the enemy talking is coming from if close enough. To simulate language barriers the mumble could be distorted if that is possible.
Discuss




