Issue: Skype for business/ Lync 2013 PSTN Incoming call drops after 90 seconds.
Error on Mediation Server ” Call terminated on mid-call media failure where both endpoints are internal”
TL_INFO(TF_PROTOCOL) 23D0.1B18::10/05/2017-00:23:53.387.0d549393 (MediationServer,ProxyCall.TerminateSession:proxycall.cs(3822))18896722Terminating Proxy side call with session state: Connected, sip-response: 410, ms-diag: 32, ms-diag reason: Call terminated on mid-call media failure where both endpoints are internal.NULL
Endpoint: UCCAPI/15.0.4953.1000 OC/15.0.4953.1000 (Skype for Business) VDI HDXRTOP/22.214.171.1249
Solution: Update Citrix HDX Connector with 2.3. This will resolve your issue.