Hello I have installed Office Communicator Standard Edition in the office, we only want to use the server for IM and presence internally. The Active Directory has a single domain of the format <domain>.local. I have enabled three users with the SIP of the format <firstname>.<lastname>@<domain>.local, sign on works fine, however users cannot see each other, they appear greyed out, I have then tried changing the SIP format to the email address which uses our external domain name @<domain>.com, when I do that sign on no longer works and I get the following error:
Cannot sign in to Communicator because this sign-in address was not found. Please verify the sign-in address and try again. If the problem persists, contact your system administrator.
After a bit of research I realized that the problem is that I need to add our real domain to the Comunicators server so it can do the sign on with the email address, however I also need to add appropriate DNS records and I am not sure how to go about that as our internal DNS is just for the domain <domain>.local.
Will I need to create a new zone on my internal DNS for the domain <domain>.com? I could then add the SRV record and the A record for the FQDN of the Communicator server, will this affect the certificate? The certificate was issued to the FQDN of the Communicators Server which is on the <domain>.local domain
