Operation was unsuccessful

[XistEnCe 1]

Hi,

 

I'm trying to set up Lync 2010 in a small lab.

I have a single server handling all the lync stuff, one domain controller, a SIP gateway and one client.

 

This far, I've been able to connect from the client to the Lync service.

When I setup a test call, through the SIP gateway - the client says

"Operation was unsuccessful".
The calling service did not respond. Waint and then try again. 
If the problem continues, contact your support team with this information. 

 

I have no idea where to start looking for the error.

Is this a typical Lync config error? Or could the problem be my SIP gateway not accepting the traffic from Lync?

 

Any pointers would be much appreciated!

[XistEnCe 1]

Figured out that this was due to a misconfiguration in the SIP gateway.

 

Now I'm dealing with:

 

The Mediation Server service has received a call that does not support comfort noise from the Gateway peer, 1.1.1.1 (SIP gateway IP)
Cause: The Gateway peer does not support comfort noise.
Resolution:
Please ensure the comfort noise option on the Gateway has been enabled.

And this:

Unexpected exception occurred in the Inbound Routing Application.
Exception: System.DirectoryServices.ActiveDirectory.ActiveDirectoryServerDownException: The RPC server is unavailable.
Name: "domaincontroller.mydomain.local"
  at System.DirectoryServices.ActiveDirectory.Forest.GetTrustsHelper(String targetForestName)
  at Microsoft.Rtc.Internal.ExumDialPlanData.GetTrustedForests()
  at Microsoft.Rtc.Internal.ExumDialPlanData.RefreshDomainDictionary()