1) Vicibox has 3 parts to the installer version, and you only listed "8", it's "8.X.X". Please post the FULL version of the installer.
2) I do not recommend express. My best advice is to re-install with standard (vicibox-install, not vicibox-express) and see if that resolves your problem.
3) You are describing a problem with inbound DIDs (possibly with a call menu or ingroup), but have shared NO information regarding the route of the inbound calls in question. For a call to arrive at an agent's phone OR meetme room, the call *should* arrive at the server, get handled by an agi script in the Vicidial suite, and then get routed ... somewhere. But we have none of this information.
4) You have also not shared any CLI output from Asterisk which may explain the behavior. When you do post CLI output, please remember to post a FULL call but NOT 3000 lines of unrelated code. If the problem is reproducible, it's best to have NO other traffic on the system and just run the test and then show the code from beginning to end of the test call.
5) To begin the troubleshooting process: We must first be certain that these calls are indeed being handled by Vicidial. For this you should share your Carrier configuration (omit or XXX any users/passwords/ips). Most important is the "context=" entry for the carrier.
6) If you have not yet done so, this would be a good time to begin the DID/Inbound calls section(s) of the Vicidial Manager's Manual as they do provide step by step instructions for configuring inbound calls.
Happy Hunting!