Dear Guy, Inder, all, Please find a proposal for new version of Figure 1. It now includes NSA as a container for NSI requester/provider sides and is in-line with Figure 2. Best regards, -- Joan A. García-Espín Network Technologies Cluster (CTX) i2CAT Foundation C/ Gran Capità 2-4, office 203, Nexus I building 08034 Barcelona, Catalonia (Spain) T: +34 93 553 2518 F: +34 93 553 2520