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Conceptual Architecture: Distributed 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+ CSCF+ MGCF SF SF+RF+MF RF+MF SF+ CSCF + MGCF Security + Policy Media Relay/E-LSR Security + Policy Routing SIP aware Firewall This model distributes Control, Bearer, and Routing plane functions in different devices across the network SF+ CSCF+ MGCF ENUM ENUM RF+MF SF+RF+MF OF functions distributed across entities |