OnPrem Lync Server 2010 cannot direct calls to O365 UM

Recently I have had the opportunity to work on multiple OnPrem Lync Server 2010 (Lync) deployments integrated with O365 Exchange Unified Messaging Servers (UM).   Issue Unable to route calls from Lync to UM. If you look at traces from the Lync Edge Server (with SipStack component traced) You should see an INVITE outbound to…

2

Exchange 2010 co-existence Exchange 2007 Unified Messaging connected to Cisco Call Manager causes users to be prompted twice when calling in subscriber accessoutlook voice access

  Over the past few months we have seen an increase in number of interop cases with Exchange 2010 Unified Messaging (UM) and Cisco Call Manager 7.0 (Configuration Notes) and 8.0 (Configuration Notes) (CCM). In this article I am going to talk particularly about one case that has seen the most hits which has also…