Vivox: Why am I not transmitting audio in iOS?

Symptoms:

• Local user is unable to be heard by others when speaking in voice chat on iOS, even though they have a valid microphone selected, are unmuted, are set to transmit into the channel, are not blocked, et cetera.

Cause:

When using Vivox on iOS, before you can use audio, you must correctly initialize the AVAudioSession category and options.

Resolution:

For information on how to configure the AVAudioSession category correctly, refer to the support article appropriate to your Vivox SDK Version as linked below:

For versions matching or later than Vivox Unity 15.1.160000-pre.1, Unreal 5.16.0.unr.0, and Core 5.15.4:

• How to: Configure iOS for audio and Bluetooth use (Vivox 5.15.4 and later)

For versions prior to (and not including) Vivox Unity 15.1.160000-pre.1, Unreal 5.16.0.unr.0, and Core 5.15.4:

• How to: Configure iOS for audio and Bluetooth use (Vivox SDK versions previous to 5.15.4)