Hi, I encounter some problem when configuring 3CX intercom with Cisco SPA5xxG phone. Configuration is as follow. I created a Paging Ring Group with everyone extension in the Ring Group with Virtual Ext 1111. The moment I dial *9 1111. My phone shows busy and all the phone in the office ring and pick up for 1 sec and hang up. I did a test on the 3CX to find out what causes it to happen. And I find out that if the Ring Group have less than 64 extension, the intercom will have no problem dialing. The intercom works fine without any problem. But once the Ring Group have more than 64 extension in it, 3CX is unable to make the call. So I conclude that 3CX have a limitation of maximum 64 extension in the Ring Group. Is there any ways to remove this limitation? And I was surprise that no one encounter this issue before. As I tried to search the net, and I couldn't find any result.