No SRV records RRS feed

  • Question

  • In the Technet documentation says that if there is no SRV records, it'll
    still fallback to sip.domain.com, sipexternal.domain.com,
    sipinternal.domain.com.  The Technet documentation says that OCS clients
    will do this.  Because of this, I'm assuming that if I don't have any
    external SRV records, both Live Meeting and Communicator will exhibit this
    funcitonality.  Am I correct in this?

    The reason I ask is, we will be using live meeting for web conferencing only
    (no audio/video) and communicator externally.  Need to make sure that both
    will work with our sip.domain.com A record.

    Monday, September 29, 2008 11:33 PM

All replies


    You will need at least three external DNS records for it to work.


    1. for the SIP data (sip.domain.com)

    2. for the external meeting name (meeting.domain.com)

    3. for the web conferencing name (webconf.domain.com) and abs


    Each name needs a cert too.


    if you want audio/vido in your meetings you also need a fourth name


    4. for the a/v name (avedge.domain.com)

    Tuesday, September 30, 2008 12:34 AM
  • Thanks Jason.  Yep, I know all about the multiple DNS and Certificate names that I need.  I'll be making the external access edge name sip.domain.com so I'll definitely already have the A record for that in External DNS.  I just wanted to make sure that the whole fallback from SRV to A record works with Live Meeting in addition to Communicator.

    Thanks again.
    Tuesday, September 30, 2008 12:45 AM
  • The Live Meeting client uses the same procedure as the OC client to locate the OCs server.  In fact Mike Stacy just blogged about this topic:



    I also have some more details on the client sign-in process related to the DNS lookups:



    Tuesday, September 30, 2008 1:13 AM
  • Jeff,  thanks for the reply.  But again, I am looking specifically only for the fallback mechanisms for LiveMeeting only, not Communicator.  I just want to make sure the mechanism is the same.  Your blog talks about Communicator only and the linked blog does talk about Live Meeting, but only how it uses the SRV record.
    Tuesday, September 30, 2008 2:31 AM
  • As I stated, Live Meeting acts the same as the Office Communicator client.  Same client settings, same DNS records, etc.  Both clients are connecting to the same server(s).
    Tuesday, September 30, 2008 12:43 PM
  • Great!  Thanks Jeff.  Also, nice blog.
    Tuesday, September 30, 2008 1:33 PM