A couple of posts ago I linked to an interesting post on another site about the XCAP protocol used in VoLTE networks for managing things like call forwarding settings. At the time I was a bit in a hurry so I bookmarked the site for further investigation. When I came back a couple of days later I noticed that “Real Time Communication” by Karel Berkovec is a treasure trove when it comes to intro articles on ‘all things IP’ in wireless operator core networks. Highly recommended!