Lync 2013 with Exchange 2013 SP1 OWA integration failed

I had a working solution Exchange 2013 + Lync2013 integrated in OWA.

I've installed SP1 for Exchange 2013 and now it doesn't work :(

I did the integration again
(added 2 strings in web.config:
<add key="IMCertificateThumbprint" value=".............."/>
<add key="IMServerName" value="Lync2012server.mydomain.com"/>)
but it doesn't help.

What changed in SP1? Why Lync integration doesn't work now?