Been reading the numerous documents for Jabber to Skype federation and just wanted to clarify somethings
For version IM&P 10.5 skype is not supported in any configuration?
For IM&P 11.5 federation is supported for an on premise skype environment but you need a VCS-C .
In a previous environment i used 10.5 to federate to an internal Lync environment using Direct federation i.e no vcs , but that looks like it has changed.