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Ports used by OCS to run Voice and Video in PC-to-PC Sessions RRS feed

  • Question

  • Hi,

    I have a query on running Voice and Video using OCS 2007 between PC-to-PC. It is known that OCS used RTA codec to run Voice, but would you be able to confirm if OCS uses RTP streams to run Audio and Video sessions between end-points.

     I am looking to prioritise the Audio and Video data from the OCS end-points on the WAN routers, therefore I need to know the protocols/ports used by OCS for Audio and Video so that appropriate policies can be configured on the routers.

     Thanks

    Puneet

    Wednesday, June 10, 2009 3:45 AM

All replies


  • The default port range used by Office Communicator R2 is 1024-65535 over both TCP & UDP. Each peer connection will negotiate communications over multiple dynamic ports in that range.

    Because this port range is so large, when allowing for peer connections through firewalls you can reduce the range by configuring specific registry keys on the computers with Office Communicator deployed: http://technet.microsoft.com/en-us/library/dd425164(office.13).aspx

    The Portrange values should not be reduced to any less than 40 total ports for correct connectivity, but using a range of any more than 40 doesn't offer any performance benefits.  That smaller range would be much easier to allow on firewalls.


    Jeff Schertz, PointBridge | MVP | MCITP: Enterprise Messaging | MCTS: OCS
    Wednesday, June 10, 2009 12:05 PM
    Moderator
  • Puneet,

    You could also look into using QoS with OCS.  Depending on the type of WAN routers you have you can prioritize based on DSCP values applied by OCS.  Here's a good article on the OCS side of that.

    http://technet.microsoft.com/en-us/library/dd572295(office.13).aspx

    Thanks,

    KP
    Kevin Peters MCSE/MCSA/MCTS/CCNA/Security+ blog: www.ocsguy.com
    Wednesday, June 10, 2009 5:07 PM
  • Puneet,

    You could also look into using QoS with OCS.  Depending on the type of WAN routers you have you can prioritize based on DSCP values applied by OCS.  Here's a good article on the OCS side of that.

    http://technet.microsoft.com/en-us/library/dd572295(office.13).aspx

    Thanks,

    KP
    Kevin Peters MCSE/MCSA/MCTS/CCNA/Security+ blog: www.ocsguy.com
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