2. Videoconferencing Network IP Network PSTN/ISDN Wireless 3G/ H.324M Gateway MCU RADVISION Products Conferencing Conferencing GWs GWs Appl Servers Appl Servers RADVISION Technology SIP, H.323, H.324M, MGCP, MEGACO Gatekeeper/Proxy

3. SIP Forwarding Engine Location Engine Application Engine Forwarding Engine Location Engine ECS MCU V3 MVP H.323 H.320 3G PSTN Radvision in the SIP world today Media Servers Web Conference Control XML

4. IM First ILEC SIP MCU RTC SIP Proxy IM First Econf

5. Proposed - IM First Extensions ILEC SIP MCU IM First Messenger Econf IM First Rich presence Microsoft APIRich presence Windows Messenger Edial