How to OCS between 2 domain RRS feed

  • Question

  • Situation:

    Two domains, domain A.com and B.com, trusts between this domain. Exchange instaled in both domains.

    OCS std. installed in domain A.com

    Q: How to join users from domain B.com to domain A.com OCS.

    Q: How to allow domain B.com users use communicator with auto login and sign in address user@b.com

    Monday, May 26, 2008 1:41 PM

All replies


    Q1: You need to create the second SIP domain in OCS (b.com) to support this.


    Q2: Inject ObjectSID of each users in MSRTCSIP-OriginatorSid field in the created contact object for the user in domain b which was created in domain a to allow you to enable them as an OCS user.



    Monday, May 26, 2008 6:59 PM
  • Just to claify, are both of these domains in the same or different forests?


    Tuesday, May 27, 2008 12:45 PM
  • Two seperated stand alone domain with two way trusts between this domains.


    Tuesday, May 27, 2008 2:48 PM
  • Meaning seperate forests and seperate OCS installations, correct? Or a single OCS install in Forest A and you are trying to allow users in the other forest to 'use' that same OCS deployment?


    Can you provide some more details?

    Tuesday, May 27, 2008 5:48 PM

    Yes thats correct two different forest and one single ocs installation.... trying to access the users of other forest (exchange server )... Can you please provide me exact steps on how to do so... Thanks..
    Tuesday, July 15, 2008 9:49 AM
  • Hello!

    you have the document at microsoft that explains in detail how to deploy into a mulit forest environment. It gives you some examples on how to configure all components. One thing that I'm not sure if it mentions is that if the trust is domain-wide then you are not able to use kerberos authentification and you should force OCS to use NTLM. If you want to use kerberos then the trust needs to be forest-wide.


    Good luck!


    Tuesday, July 15, 2008 10:49 AM
  • You may want to read this document

    Office Communications Server 2007 Document: Configuring Office Communications Server 2007 in a Multiple Forest Environment




    Tuesday, July 15, 2008 11:13 PM