Today with CUWL you get WebEx and only get ports based licensing access to MC
audio would then come from mp
If you want to sell pure hosted WebEx named or active host with access options to other centers then you need to use SKU outside CUWL using gpl sku
Audio however is not available today using those SKU either (unless you use SMB Offer) and would need either WebEx team to be involved or SP audio
Thanks
Srini