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Wireless Bearer (RTP/IP) Signal (SIP) Conceptual Architecture Composed PE MG: Media Gateway MGC: Media Gateway Controller LD: Long Distance SBC IP Phone IP Phone PSTN MG MG SS7 SS7 SBC SBC SBC Wireless 3rd Party IP Network MF RF Session Border Controller (SBC) PSTN Composed architecture integrates Control, Bearer, and Routing planes in same device. Risk: N2 connectivity, cost, bottleneck, hot-potato route OF SF CSCF Proxy MGCF CSCF Proxy MGCF |