This deliverable describes the system architecture used for the prototypes in the second trial. Additionally, studies on related topics, which are not going to be implemented, are included in this document. The base for this specification is D1201. For the second trial, a couple of ex-tensions are specified, including

• Inter-operation with MPLS
• Enhanced resource distribution, taking into account extended network topologies
• Feedback of network usage information into several points of the resource control process
• Extended application interface for the support of legacy application, SIP inter-working and grouping of a set of related reservations
• Inter-domain resource reservations
• Logging of usage data
• Extended QoS management capabilities

Studies are provided covering

• Advance reservation
• Content delivery networks
• IP multicast
• Security issues