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Conceptual Architecture: Centralized (IMS) NNI PE IP Phone IP Phone Sprint VoIP Other VoIP PSTN PSTN MG MG SS7 SS7 Wireless Wireless 3rd Party IP Network PSTN PSTN Media Relay/MPLS Switch SF MF RF MF RF IBCF+I-CSCF+ SF Security + Policy Media Relay/E-LSR Security + Policy Routing Media Relay/E-LSR Security + Policy Routing Control plane of SBC integrates with CSCF, Bearer + Routing planes integrate with edge routers. One-to-many model ENUM ENUM SF CSCF BGCF CSCF SF BGCF OF functions distributed across entities |