Call signaling/Media control

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Presentation transcript:

Call signaling/Media control 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

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

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

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

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

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

Figure 8-7 Signaling separate from VoIP conversation Real time Transport Protocol VoIP Conversation UDP Call setup signaling 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 Called party Calling party Signaling uses TCP/IP Conversation uses UDP Media Gateway

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