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Why Both Push and Pull? Service Control Session signalling e.g. SIP+SDP Policy Decision Point Policy Enforcement Point User Data Possible user resource control signalling e.g. RSVP Rs interface uses Q.3301.1 (Diameter) Rw interface uses Q.3303.x (Diameter, etc.) PEP duties: packet admission/rejection QoS marking of packets NAT For sessions without user resource control signalling, Rs interface is used for authorization, reservation, and commitment (PUSH mode, triggered by session signalling). For sessions with user resource control signalling, request for commitment flows from PEP to PDP across the Rw interface (PULL mode). |