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.