Peer-to-peer A/V disconnected over ISA site to site VPN RRS feed

  • Question

  • Hi,

    Recently deployed OCS 2007 R2 at a customer.
    Got one HQ site were the OCS R2 std server is located.
    There is one remote site with a couple of MOC clients.
    The HQ site and the remote site is connected by site to site VPN with one
    ISA Server 2006 in each location.
    All traffic is allowed between the 2 networks.
    Multi part A/V (traffic routed thru the OCS server) is working fine with participants at both locations.
    Peer-to-peer A/V with one participant at each location connects for 3-5 seconds and then disconnects.
    Error in MOC at both sides: Disconnected because client stopped recieving audio from XXXXX.
    Peer-to-peer A/V between MOC clients at one location works fine (no problem with client FW).
    MOC clients can send files directly between the sites.
    No errors in the event log on the OCS server.
    No traffic is being blocked when monitoring the ISA server.

    Any idea how to solve this issue? Any ISA server configuration that has been missed?

    BR, Magnus

    Tuesday, September 1, 2009 12:07 PM

All replies

  • Maybe there is a problem with the using dynamic voice ports form one to another moc client. You can make a networktrace with netmon to see wich problem you have.
    Tuesday, September 1, 2009 1:38 PM
  • I ran tracerout between the clients and it works fine.

    Monday, September 7, 2009 6:32 PM
  • hi 
    Was your issue resolved?

    Thursday, September 10, 2009 3:09 PM
  • Hi, I had the same issue and it was very frustraiting for us, after installing wireshark and netmon to look into QOS tagging I found that ISA was playing with packets from the communicator client. Once I realised that it was ISA I started looking into the ISA config, and the site to site routes, I noticed that locally packets were hitting ISA rather than hitting moc client on each site. To resolve:

    RDP to each ISA server.
    Open ISA snapin
    Drill down ISA \ Configuration \ General
    Open Define Firewall Client Settings
    Open Applicaiton Settings
    Click new
    In application type communicator
    In "Key" choose  dissable
    In "Value" choose 1
    click "OK"
    Click "OK" again
    Click "apply"
    Restart your client "test" pc
    Do again on the other isa server and reboot the second test pc.
    Test, post up if it resolves your issue.

    Monday, October 5, 2009 4:54 PM