Office Communicator 2007 Clients cannot login automatically

Posted on 2009-02-24
Last Modified: 2013-11-29
Hi Xperts
I have a running OCS2007 Server Standard Edition which seems to be correctly configured. The problem is that my Office Communicator Clients do not seem to logon automatically(internal). I have a feeling it is the DNS configuration but hopefully you can advise based on the following info.

I have created a single SRV record in my internal DNS Zone called ZoneA.
The domain is  FQDN, so
The service/name for the SRV record is _sipternaltls
The protocol is _tcp
The port is 5061
The host offering the server is the FQDN of
I have a A record for the OCS Server created when I originally added the server to the domain.
NOTE: The SIP logon is the Exchange

When I log onto Office Communicator Client, the sign in name changes to my email address which is correct but says server is unavailable.

If I run the NSlookup and set type to SRV and then type all the info seems correct.

Am I missing a subsequent DNS setting?
Hope u can help?
Question by:Jamesshaun
    1 Comment
    LVL 12

    Accepted Solution

    For client autoconfiguration you must have DNS records in the zone matching the sip URL.  In your case
    In the forward DNS zone for put in SRV record pointing to host on port 5061.
    Add host record pointing to IP of OCS SE Server.
    The Subject Alternate Name of the Cert on OCS must contain

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