I used my iPhone 6 and paired with a bluetooth audio device (mic/speaker). Then I tried:
1. Using facetime to make a video call: Can hear remote from BT device, and remote can hear me.
2. Using lifesize video: Works well as using facetime.
3. Using LINE to make a video call: works well as using facetime.
4. Using lifesize cloud app: Can NOT hear remote, and remote can NOT hear me.
And, I also tried following smartphones:
1. iPhone 6S (iOS: v9.3.2): Not working.
2. iPhone 6 (iOS: v9.3.1): Not working.
3. iPhone 5s (iOS: v9.3.1): Not working.
4. iPhone 4s (iOS: v9.3.2): WORKING !!!
5. ASUS (Android): WORKING !!!
Does lfiesize cloud app doesn't support this for iPhone 5s/6/6s ??