Hi Tom,
Salvatore Nestor pretty much answered this one for me. The speakerphone is not available when using VoIP in order to reduce background noise. If you use regular voice calling over the cell network (dial in manually or have WebEx call you back over cellular), then the audio is outside of the WebEx app and the phone itself handles the speakerphone mode.
We're working on ways to improve VoIP quality on mobile devices and also reduce background noise to allow a speakerphone experience that meets the level of quality our customers expect from us.
Hope that helps. And thanks again to Mr. Nestor for his response.
Mark
Marketing Manager
