I have a functional 3CX phone system up and running using all Yealink T42G phones. They can call between each other, no problem. By dialing *9<extension>, I'm able to page between phones. Now I'd like to be able to page to a loudspeaker system using a CyberData Paging Gateway. I've created a new extension, like so: image no longer available And I've set up the paging gateway SIP settings as follows: image no longer available I've made sure that all extensions have the "Can Intercom" right. When I try to page from a phone to extension 205, the paging gateway, I hear a busy tone and get a "Temporarily Unavailable" message on the phone LCD. I understand that the CyberData device is not an "officially" supported piece of hardware, however, is this something that should still be possible to achieve?