S20 with voip.ms

I have everything showing as registered but incoming calls do not ring.  Outgoing works properly.  I am trying to use SLA with two appearances of each of four DIDs on Yealink T48S phones.  I think this is the same problem in article 229633507-How-to-Use-SLA.  The comments say there is a bug in the S Series software but there is no indication of whether the bug has been fixed or anything that gives a work-around.    

Can anyone help get this sorted out?  Thanks.








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