OCS 2007 R2 Edge Server and External Clients RRS feed

  • Question

  • Dear All;

    we have one front end server and one edge server ublished using ISA server.ocs 2007 r2 used.
    every thing is working properly, but we face a problem regarding the external clients voice conference.
    when communicating with exteral client audio call, after 4 minutes or 6 minutes the call is disconnected alone.
    how can i troubleshoot this problem ?
    is there any reason for his behaviour ?


    Tuesday, August 4, 2009 10:43 AM

All replies

  • Dear Ali,

    do you have OCS 2007 monitoring server installed in your enviroment?
    Tuesday, August 4, 2009 12:42 PM
  • Dear;
    yes , we have installl it.
    Tuesday, August 4, 2009 2:20 PM
  • Are you using NAT?

    If yes, you can see in page 59 of the document "OCS 2007 R2 Deploying Edge Servers.doc" the following text:

    If you use ISA Server as your firewall, configuring it as a NAT is not supported because ISA Server 2006 does not support static NAT.

    Bruno Estrozi - MCSE/MCTS/MCITP - Unified Communications Specialist | http://brunoestrozi.spaces.live.com
    Tuesday, August 4, 2009 9:16 PM
  • Dear Brun;

    yes, iam using  NATING , but this limitation that talk about has been removed in OCS R2. another thing all vedio/audio calls are working fine.
    but sometimes the call ended after 4 minutes or 6 minutes. sometimes its working for 1 hour.

    we are using edge server with to NICs. one for internal and the other with three private IP's nated using ISA server.

    Tuesday, August 4, 2009 9:55 PM
  • No this isn't been removed in OCS R2! This is an limitation of ISA Server and not of OCS. Yes, OCS R2 can be used with NAT, but not NAT provide by ISA Server.

    This observation can be found in documentantion of R2 implementantion guide.

    Bruno Estrozi - MCSE/MCTS/MCITP - Unified Communications Specialist | http://brunoestrozi.spaces.live.com
    Tuesday, August 4, 2009 10:16 PM
  • Dear Bruno;

    i qoute this from social.microsoft.com ( http://social.microsoft.com/Forums/en-US/communicationsserveredgeservers/thread/bdd17f4c-454d-472d-96ff-d4993dd8eff5)

    Hi Stevens,

    As per the OCS Edge Server Architecure, you could have either 4 NIC's or 2 NIC's on the OCS Edge.

    If you go with 2 NIC's on the Edge, you would have to ensure the following are met,

    1. External NIC used for external communication of clients with Access Edge, Web Conf Edge and the A/V Edge. If you have installed OCS 2007 R2, you would need 3 private DMZ IP's on the same NIC that would be natted to the 3 respective public ip's on the ISA External adapter.e.g ( for AccessEdge/ for WebConfEdge/ for A/VEdge all on the same NIC)

    2. Internal NIC used for internal communication with the front-end and also the same nic would be used for all the 3 components. e.g (

    Please note you open the required ports on the firewall for both internal and external communication.

    Hope this clarifies your doubts. Let me know in case of any other queries/concerns.


     Savio Fernandes Sr Consultant MCTS/MCITP/Windows2008/Exchange2007

    i am confused , as we have hte same setup that SAVIO talk about.( 2 NIC's for Edge).

    also , in the documentation that you told me about, its not clear, if it's for multiple edge deployment or single edge deployment ?

    i appreciate your help, since i dont know if am proceeding in the right way . 



    Wednesday, August 5, 2009 2:35 PM