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Figure 8-1 Comparing PSTN and VoIP voice call setup

Figure 8-1 Comparing PSTN and VoIP voice call setup. Circuit-switched Network. Media Gateway. IP Network. Call signaling/Media control. Call signaling. Media control. Media exchange. Media exchange. Media Gateway. IP. 8001. 8002. IP Phone – Calling party. IP Phone – Called party.

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Figure 8-1 Comparing PSTN and VoIP voice call setup

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  1. Figure 8-1 Comparing PSTN and VoIP voice call setup Circuit-switched Network Media Gateway IP Network Call signaling/Media control Call signaling Media control Media exchange Media exchange

  2. Media Gateway IP 8001 8002 IP Phone – Calling party IP Phone – Called party Call setup Signaling Media Flow Figure 8-2 Relationship Between Signaling and Media Flow

  3. IP Network PSTN ISDN H.323 Terminal H.323 Terminal H.323 MCU H.323 Gateway H.323 Gateway H.323 Gatekeeper Figure 8-3 Components of a Multimedia Communication Service

  4. Gatekeeper Media Gateway Media Gateway IP IP IP WAN Router Router IP Phones IP Phones MCU Figure 8-4 Gatekeeper

  5. IP WAN Media Gateway Gatekeeper IP IP Router Router IP Phones IP Phones MCU Figure 8-5 H.323 Zones

  6. AS 200 AS 100 BGP protocol running here connecting the three AS (Autonomous Systems) together AS 300 Figure 8-6 Interdomain routing

  7. Media Gateway 1. Off hook 2. Send Dial tone 3. Dial number 6 Receive IP 4. is phone on hook? Yes 5 .Give caller ip address 7. set up UDP port 8. Ring signal Call setup signaling Signaling uses TCP/IP Conversation uses UDP UDP UDP Called party Calling party UDP Real time Transport Protocol VoIP Conversation Figure 8-7 Signaling separate from VoIP conversation

  8. Chapter 8 Figures [FIG]Figure 8-1 Comparing PSTN and VoIP voice call setup [FIG]Figure 8-2 Relationship between signaling and media flow [FIG]Figure 8-3 Components of a multimedia communication service [FIG]Figure 8-4 Gatekeeper [FIG]Figure 8-5 H.323 Zones [FIG]Figure 8-6 Interdomain routing [FIG]Figure 8-7 Signaling separate from VoIP converstion

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