dialer server not turned on in cluster
call times for inbound group don't allow inbound calls
did not pointed to Ingroup (presuming you mean to call the ingroup a "queue", which it is not, asterisk has "queues" and vicidial does not use them, so calling anything in vicidial a queue is likely to cause a misunderstanding).
inbound CID was listed in a filter and thereby rereouted to the filter setting instead of the ingroup to which the DID is pointed
... the list goes on and on. Basically the concept is that Any Setting in the DID or Ingroup can cause either one to fail. Additionally any setting on a server or the base cluster can make the server or cluster fail ...
Of note: You did not list your Vicidial Version with Build, nor did you list your installation method. Posting a problem without any technical data and a vague description of the problem is very similar to calling the Ford dealership and asking for a quote to fix your car because it "don't work" LOL
1) Vicidial version with build (required)
2) Installation method with version
3) Detailed description of the problem (with CLI output from a single attempt) is often very useful (not 3000 lines of code mind you, just a single attempt from start to finish in a test environment with no other calls in the system at the moment of testing)
4) Detailed configuration description for all settings you believe "Pertinent" to the situation. We'll ask for more if you miss any, of course which may help you in your next instance with this particular problem.
Many people find that if there is an actual error in the CLI a google of that error will resolve the issue (through a search of that term on this forum by google!)