Forum Discussion
Skype For Business On-Premesis - Unable to communicate with federated domains
Hello, We currently have an SFB 2015 Enterprise setup which includes an Edge server. I was not a part of this initial setup but have been recently assigned to manage our SFB environment. Cur...
Hi,
It is not that the UPN/Email doesn't match the SIP address since you are able to find the federated contact (you can see their presence). I rather think that it is a problem with certificate (their Edge doesn't trust your Edge), firewall issues (ports not opened) or some other configuration problem.
I suggest that you use the Skype for Business Debugging tool and collect logs to analyze.