OCS2007 to LCS2005 communication problems RRS feed

  • Question

  •  We are at the stage of migration from LCS2005 to OCS2007, 
    At this time we have LCS2005 SP1 Enterprise which contains about 99% of all users and test OCS2007 R2 Standard with users involved in testing phase, we had the following problems: 
    Users who is on OCS2007 sending a message to LCS2005 user could not be delivered and users from LCS2005 can not respond in the same session(initiating a session from OCS2007 to LCS2005),
    if the session initiation from LCS2005 to OCS2007 a session is set and everything works greate. 
    This problem was described, and the decision was (is) to install the updates on LCS2005 
    On the recommendation of MVP, install update 911996 and 921543 
    What has been done but the problem has not disappeared. 

    Farm is:
    LCS2005 Server 
    Windows Server 2003 SP1, x86, Enteprise 
    LCS 2005 Enterprise (2.0.5470.0) instaled hotfixes (KB9118966, KB921543, KB950614) 

    Windows Server 2008 Standard x64 
    OCS2007R2 Standard x64 (3.5.6907) 

    MOC2007 Client 2.0.6362.111 
    MOC2005 Client 1.0.559.226 

    Your comments? Recommendations?


    Arman Obosyan
    Wednesday, February 11, 2009 6:34 PM


  • Finaly got answer on my case

    From the SIP trace analysis I expected that you don't have a hardware balancer for at least the LCS server.

    Unfortunately We don't support LCS enterprise edition server without a hardware load balancer even if the pool has only 1 FE server. this is a limitation in LCS and the workaround was to have a second IP on the same Network adapter (just like you have) but this workaround only works for Clients and will fail when you have Pool to Pool communication.

    The only solution you have here is either

    1-deploy a hardware load balancer in front of the LCS Pool

    2-Build an LCS Standard edition server and move all the LCS users to the new server

    3-move all the users to the OCS 2007 R2 Pool.


    Arman Obosyan

    • Marked as answer by Arman Obosyan Tuesday, March 10, 2009 7:30 PM
    Tuesday, March 10, 2009 7:29 PM