You can set up round robin call routing in the termination field.  You can separate multiple numbers with semi-colons.  If the first number doesn’t answer, the call will then divert to second number and so on.  This does not compromise call tracking.  You can also set up time of day routing if you want the calls to ring to certain numbers at certain times.  This can be accessed by clicking the time of day routing link next to the termination number field.