I got "The Audio Device is Unaccessible Now" when trying to connect audio to WebEx session using computer. It's known issue for 64-bit installations and common workaround is to setup 32-bit browser and Java. It works, I saw it by myself.
But I got the same issue on Ubuntu 12.04 LTS 32 bit.

Firefox 16.0.2 (Mozilla Firefox for Ubuntu canonical - 1.0) or Chronium Version 20.0.1132.47 Ubuntu 12.04 (144678) - does not matter.
Java(TM) Plug-in 1.7.0_09.

Java 7 - Oracle 32 bit:
java -version
java version "1.7.0_09"
Java(TM) SE Runtime Environment (build 1.7.0_09-b05)
Java HotSpot(TM) Server VM (build 23.5-b02, mixed mode)

Does anyone know what could be wrong?
Thank you in advance.