This has been thankfully the only minor problem we have after updating to v20.
I have a Fanvil i10s that call a dummy ext. that forwards the call to a page manually by dialing the dial code for paging (*8) and the extension.
After the office hours the call is forward to our private security...
Paging extension to extension (intercom) on this system was set up with *11. It quit working after firmware upgrade. I had another system that was set up with *9 that I had to change to *8 after firmware upgrade to fix paging. I tried that on this system. here's what I found.
1) on the router...