I'm running version 12 (I know). For the first time I'm trying to create a conference from my 3cx app on windows. I do the following: Click Conferences Click "Create Conference" Click "Add Number" Enter a mobile number as I would if I were dialling an external number (e.g. 078123456789) Click "+" Click "Start Conference" My desk phone rings with "Conference" on the screen I answer the call My client shows that the call to my mobile phone failed Where am I going wrong? Is there a permission I need to setup for this? Thanks.