Microsoft has released a Cumulativ update package for 5 different components in LYNC Server 2013
Version number for this CU is

5.0.8308.949

The Patches are:

• April 2016 cumulative update 5.0.8308.949 for Lync Server 2013, Core Components
• April 2016 cumulative update 5.0.8308.949 for the Lync Server 2013 Response Group service
• April 2016 cumulative update 5.0.8308.949 for Lync Server 2013, Front End Server and Edge Server
• April 2016 cumulative update 5.0.8308.949 for the Lync Server 2013, Mediation Server 
• April 2016 cumulative update 5.0.8308.949 for Lync Server 2013, Shared Line Appearance

The issues fixed are:

• KB 3148961 Event ID 56417 when the window title of combined programs exceeds 128 characters in Lync Server 2013
• KB 3148960 �New sharer joined the conference� message when you try to share your desktop in an online meeting in Lync Server 2013
• KB 3148959 Bootstrapper.exe doesn�t start on a non-English version of Lync Server 2013 RTM
• KB 3141122 Debug-CsInterPoolReplication returns �BATCHES OUT OF SYNC� error in Skype for Business Server 2015 or Lync Server 2013
• KB 3148956 Lync Server 2013 announcement service can�t transfer an incoming call from iOS device
• KB 3148256 Event ID 31128 occurs when RGS can�t synchronize an Agent Group member�s SIP address
• KB 3148962 Stop error D1 when you try to stop Lync Edge services gracefully in Lync Server 2013
• KB 3148950 Contacts and Meetings dates may be lost on Lync Server 2013 Front End server
• KB 3148965 You hear noise or nothing at all when a call is forked to a PSTN number in Lync Server 2013