My company is currently running Lync 2010 server and clients. We have federations with some customers running Skype for business. Some of my users are experiencing sporadic issues joining Skype for business meetings scheduled by the customer. I am
finding that if I delete the SIP_xxx profile directory on their PCs and let Lync recreate it the problem will be resolved, sometimes for weeks, then it occurs again. My conclusion is that there is some type of corruption happening in their profile folder,
which is causing the errors, but I am looking to better define what is causing the corruption and if there is a better solution than manually recreating the Lync 2010 profiles.
check if the issue is specific to certain machine built, also make sure that the client is updated to the latest CU. You can also try with a higher version client if that is allowed and test the behavior
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