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How av calls ,sharing and webconferencing works between two federated partners RRS feed

  • Question

  • Hi everybody, please I need to understand something that is still a little bit confusing to me. Let me tell you the following scenario.

    two organizations federated.
    two users  LU1@contoso.com and LU2@company.com who wants to communicate using lync client within their organization.
    Im and presence is working fine, which means that Access edge servers are connected over port 5061

    Next step:
    LU1@contoso.com wants to communicate and share desktop with LU2@company.com

    LU1 intiates AV call conference.
    what happens?
    I have understood that there is an invite from lu1 which flows over both edge servers reaching the LU2@company.com client.

    but after that what happens?
    does the client LU1@contoso.com connects to the  internal interface of his webconference edge first, and the same happens to LU2@company.com with his av edge server and then both edges connect one to each other
    or

    the client LU1@contoso.com who initiates the av call goes directly to the federated av edge server, which means the traffic goes from this client directly to av.company.com external interface while LU2 client connects to his av edge server on the internal interface?

    Hope that all this is clear

    Thanks
    Tuesday, November 6, 2012 6:45 PM

Answers

  • There is no simple explenation on how ICE/STUN/TURN works this would take pages to explain, most certainly in a Federated call

    I suggest you look at an Excellent session from Thomas Binder explaining all of this stuff
    http://channel9.msdn.com/Events/TechEd/Europe/2012/EXL412


    - Belgian Unified Communications Community : http://www.pro-lync.be - MCM/MVP/MCT

    • Proposed as answer by ThomasBinder Friday, November 9, 2012 10:29 AM
    • Marked as answer by maipercaso Monday, November 12, 2012 8:48 PM
    Wednesday, November 7, 2012 1:41 AM

All replies

  • When there are only two users the AV call is not actually a conference. It is only when three or more people are involved when a conference is initiated in this case via the AV MCU. Getting back to your question with only two participants they will attempt to negoiate a media path between each other. The preferred route is a direct connection but often this is not possible because of NAT so then the respective Edge servers will play a role in the STUN/TURN process to select a combination of IP addresses and ports that provide the best path.

    Tuesday, November 6, 2012 8:16 PM
  • There is no simple explenation on how ICE/STUN/TURN works this would take pages to explain, most certainly in a Federated call

    I suggest you look at an Excellent session from Thomas Binder explaining all of this stuff
    http://channel9.msdn.com/Events/TechEd/Europe/2012/EXL412


    - Belgian Unified Communications Community : http://www.pro-lync.be - MCM/MVP/MCT

    • Proposed as answer by ThomasBinder Friday, November 9, 2012 10:29 AM
    • Marked as answer by maipercaso Monday, November 12, 2012 8:48 PM
    Wednesday, November 7, 2012 1:41 AM
  • It didn’t go through federated A/V edge server directly and it seems none of business with webconference edge.

    You can download the Chapter_09_External_User_Access in Microsoft Lync Server 2010 Resource Kit.

    You will find the call flow between federated users in A/V conference.

    http://www.microsoft.com/en-us/download/details.aspx?id=22644


    Please remember to click “Mark as Answer” on the post that helps you, and to click “Unmark as Answer” if a marked post does not actually answer your question. This can be beneficial to other community members reading the thread.

    Wednesday, November 7, 2012 11:51 AM