When making a call, you will see a visualization of your voice inside of the dialer. The animated wave form has two waves that respond to the volume coming through the mic of each user. The waves are different colors to represent the caller (Purple) and the person being called (Teal).
If bandwidth is low, the animation will not respond directly to volume, but will just move when each user is talking. You can now see when your prospect is talking and when you are being heard, so you can quickly identify and take action if you or your prospect have muted yourselves.
If you are using call passthrough, you will not see the waves respond, because the call has been passed through to your other phone.
Voice Detection is currently available in the in-app dialer.