Since there are no replies, try to isolate the problem, i.e. is something wrong with line 2?
First thing I would try is to configure line 1 with the second GV number that you have, as the only line. Verify that individually the second GV number works fine with your Obi202.
Once you have that, leave line 1 unconfigured and put the same number back on line 2. Verify that incoming and outgoing still work.
Now that you have a single GV number verified working on both lines, attempt to configure both GV numbers at the same time, and check the results again.