I don't think you understand how vectors control calls.

If the call is queuing to a call center skill, then the logic is very simple. It's the same logic that "wait 30 seconds hearing music" and then says "your call is very important to us, please wait". You could just as easily use that logic to "wait 30 seconds hearing music" and then play "your call is not very important to us, so we're dropping it"

That is assuming the vector is in control of the call. A call can be routed to a station/telephone and you would use a coverage path to provide further treatment after X seconds of no answer.

Show us how your call is coming in and where your call is going and I'm sure someone can tell you how to accomplish what you're trying to do.