In the portal on extentions and options. There is an option titled “Screen Calls by requesting caller name using IVR”. I have that checked, but the IVR is not asking the caller name.
The rebound feature can be found under the extensions forwarding rules, when options Forward to mobile or Forward to number are selected.
This will provide the called party the option to answer the call or send the call to voicemail after the called party hears the calling number.
More info on forwarding rules and how to set them can be found here: https://www.3cx.com/user-manual/web-client/#h.astrf9gj7wbb/