ZyXEL ISG50-PSTN User Guide - Page 28
Security and Routing, Application Scenarios, Internet - to voip
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Chapter 1 Introducing the ISG50 company can call each other by dialing extensions. Calls to the outside world go through the IP PBX to the PSTN, ITSP, or ISDN. Figure 1 IP PBX Example ITSP Internet ISG PPSSTTNN/ISDN The ISG50 can function as a stand alone telephone switchboard for a small organization. It can also supplement a legacy PBX within an organization by providing VoIP telephony features. See Chapter 2 on page 37 for a more detailed overview of the ISG50's features. 1.1.2 Security and Routing The ISG50's security features include VPN, firewall, ADP (Anomaly Detection and Protection), and certificates. It also provides bandwidth management, Instant Messaging (IM) and Peer to Peer (P2P) control, NAT, port forwarding, policy routing, DHCP server and other powerful features. Flexible configuration helps you set up the network and enforce security policies efficiently. See Chapter 2 on page 37 for a more detailed overview of the ISG50's features. The ISG50 provides excellent throughput with the reliability of dual WAN Gigabit Ethernet ports and load balancing. You can also use a 3G cellular USB (not included) for a third WAN connection. The ISG50 lets you set up multiple networks for your company. The De-Militarized Zone (DMZ) increases LAN security by providing separate ports for connecting publicly accessible servers. The ISG50 also provides two separate LAN networks. You can set ports to be part of the LAN1, or DMZ. Alternatively, you can deploy the ISG50 as a transparent firewall in an existing network with minimal configuration. 1.1.3 Application Scenarios Here are some common application scenarios for the ISG50. 28 ISG50 User's Guide
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