What audio conferencing is supported 2?
Connect using your device’s audio system over the Internet (iPad, iPhone, and iPod Touch when using cellular or Wi-Fi (VoIP-only attendance is available on WBS 28 or Cisco WebEx Meetings 1.2 or greater).
WebEx Audio, MeetingPlace audio, Telephony Service Provider or Third Party Service Provider (Telephony and VoIP), and VoIP-only audio are supported (requires T28 and above). WebEx VoIP is not available on TSP WebEx sites.
If you do not use integrated WebEx Audio or the meeting does not have WebEx VoIP enabled, then you will need to manually join the audio conferencing on a phone.