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…

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Users unable to join Lync hosted conferences from Cisco Unified Communications Manager 8.5

In the past couple of months we have seen increase in DTMF issue relating to Cisco Call Manager v8.5 connecting to Lync Server 2010 (Lync). I worked on a few of these issues giving me an opportunity to dive deep into this integration. Cisco Unified Communication Manager (CUCM) v8.5 is supported with Lync Server 2010…

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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…

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Exchange 2010 SP1 Unified Messaging cannot transfer call to an extension

  There are a number of reasons that may lead to calls not being transferred correctly to extensions homed on gateways – Cisco Call Manager, Audio Codes, OCS\LYNC amongst others, one of them blogged by me here. In this blog I am going to talk about another issue we have seen with our customers.   ISSUE…

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Exchange 2010 SP1 Unified Messaging integration with Nortel CS1000

  With the release of Exchange 2010 SP1 we have seen some issues integrating with Nortel CS 1000. Nortel CS 1000 is currently not part of the Telephony Advisory Program and not certified for Exchange 2010 & 2010 SP1. It is currently supported only when it connects to Exchange UM through one of the supported IP…

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Exchange 2010 SP1 Unified Messaging inter-op with OCS – Location Profiles

With Exchange Unified Messaging 2010 SP1 the call transfer to extension has improved to facilitate OCS to make the decision on how to route the call. Prior to UM 2010 SP1, UM will send the actual location profile to be used to make the call to the user by OCS. This was indicated in the…

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Remote Call Control in Office Communications Server R2 uses UPDATE method to maintain persistent sessions between Communicator 2007 R2 and CSTA Gateway

  For most of the administrators who have ran into issues with RCC my colleagues blog has been a great help. With the evolution of OCS and the SIP standard, there have been two changes in the behavior since the time Rajesh put that blog out. Hopefully this blog with help you look out for…

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