It is possible to create Ring Groups with current version (V3.1.2434). Maybe u just need a clean install of 3cx ? Give us more info about your issue.
Cheers
Following a first installation of the version v3.1.2434 on Windows 2000 I create 3
extensions for example 1000,1001,1000
I cannot validate them as a member in a group of call number 8000
Ring Groups work perfectly. Do you see the list of extensions when you create a ring group? You should see the list of available extensions - see below..
Ring Group Members:
Select which extensions are a member of this ring group.
Extensions
1000
1001
1002
Do you see the extensions you created on the left??
Yes I see extensions 1000,1001,1002 perfectly on the left. I select them
(to add) they appear on the right and when I validate it disappear on the right and groups it does not function
Did you perform a clean installation or an upgrade? Perform a clean uninstall, and install the latest version of 3CX from scratch. Ring groups work for sure - and they work perfectly. You can rest assured.