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Other resource control scenarios A number of endpoints and network technologies may not have QoS capabilities or may not be able to support path coupled signaling The endpoints can be cateogrized into 3 types, 1) no any QoS capabilities; 2) only support the request at the application layer; 3) understand network QoS and support network layer signaling Some networks does not support path-coupled signaling for QoS reservation on a per flow basis, e.g. Cable, DSL, Ethernet and MPLS SPs may not intend to rely on endpoints for network QoS request due to complexity, scalability and cost-effectiveness issues. The resources controlled by a policy framework are extended more than the QoS, such as Address latching and media relay, security and deep packet inspection According to the rationale of NGN as defined by ETSI TISPAN and ITU-T, application functions (e.g. SIP proxy, IMS) should be totally independent of transport networks and can be in different domains The trigger for application session may be different from that for resource control session |