1. Figure 7-1 Softswitch Components Signaling Gateway Feature Server Softswitch Universal Media Gateway SGCP SIP MGCP MGCP (Media Gateway Control Protocol) SGCP (Simple Gateway Control Protocol) call agent SIP ( Session Initiation Protocol)

2. Figure 7-2 PC to PC and PC to phone IP Network Voice Gateway Class 4 Switch Telephone PC

3. Figure 7-3 IP phone on an IP network IP Telephone IP Network Data Softswitch Server

4. Figure 7-4 SOHO grade gateways IP Network Softswitch Data Server Telephone

5. Figure 7-5 Enterprise gateways on a VoIP network IP Network Voice Gateway Server Data Softswitch PBX Digital Telephone Voice Gateway PBX Digital Telephone

6. Figure 7-6 Centrex using a Class 5 switch IP Network Voice Gateway Server Data Softswitch Digital Telephone Voice Gateway Digital Telephone Class 5 Switch

7. Figure 7-7 IP PBX also known as soft PBX IP Network IP PBX IP Telephone

8. Figure 7-9 IP Centrex using a Class 5 switch IP Network Voice Gateway Telephone Class 5 Switch GR303 Gateway

9. Figure 7-9 IP Centrex with Softswitch IP Network Voice Gateway Server Data Softswitch PBX Digital Telephone Voice Gateway PBX Digital Telephone

10. Figure 7-10 Architecture of Class 4 and Class 5 switches with VoIP gateways IP Network Voice Gateway Server Data Softswitch Telephone Voice Gateway Telephone Class 4 Switch Class 5 Switch

11. Figure 7-11 Class 4 replacement Softswitch solution Note the absence of Class 4 TDM switches IP Network Softswitch Data Server Voice Gateway Class 5 Switch Telephone

12. Figure 7-12 Class 5 replacement Softswitch solution IP Network Voice Gateway Server Data Softswitch Telephone Voice Gateway Telephone

13. Figure 7-13 Legacy networks: separate voice and data networks Class 5 Switch Telephone Data Network voice Network SS7 Class 4 Switch Class 5 Switch Class 4 Switch Telephone

14. Figure 7-14 Converging networks: combined circuit- and packet-switched networks Telephone IP Network Class 4 Switch Class 5 Switch Universal Media Gateway Softswitch SS7 Server Class 5 Switch Telephone

15. Figure 7-15 A converged network voice and data on the same network IP Network Server Softswitch IP Telephone Telephone Enterprise Media Gateway SOHO Media Gateway Carrier Grade Media Gateway IP