My phonerlite was working perfectly (love the product) until moments after I had to install Skype for Business (chrome plugin and full program).  Immediately after installing S4B, I cannot make any calls.  In PhonerLite I receive 486 error everytime I attempt an outbound call.  In Phone, I see 404 error.  This must have to do with a conflict with S4B, because it happened immediately after installing that.  Unfortunately, I cannot uninstall that program.  I upgraded to the most recent version of PhonerLite with no change.  Help, I really love your program--my favorite SIP client of many I have tried.