I just thought I'd drop this very important bit of information that is completely missing from any Polycom documentation - or at least that I can find... Thanks to T3 support for giving the script...
In order to get CSS 1.4 working with RealConnect - by default the DMA fails to route it Lync/Skype. You need to;
1. Create a new Dial Rule that is set to - Resolve to External SIP Peer
2. Enable the preliminary script and type in this...
// user agent header will identify the caller as a CSS.
if ( userAgentHeader == null || !userAgentHeader.match(/CSS Lync Gateway/g) )