In version 4.5.50 and later, there is a bug within the Inin Conference option, in that when you try to Conference the call, and error is thrown and the conference does not work.
There is a workaround...
Use the 'Connect Both' button instead of 'Conference' - it provides the same result.
Article ID: 801, Created: June 29, 2016 at 3:43 PM, Modified: June 29, 2016 at 4:28 PM