ZyXEL ISG50-PSTN User Guide - Page 87
Configuration Basics
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CHAPTER 6 Configuration Basics This information is provided to help you configure the ISG50 effectively. Some of it is helpful when you are just getting started. Some of it is provided for your reference when you configure various features in the ISG50. • Section 6.2 on page 91 introduces the ISG50's object-based configuration. • Section 6.3 on page 92 introduces zones, interfaces, and port groups. • Section 6.4 on page 94 introduces some terminology and organization for the ISG50. • Section 6.5 on page 94 covers the ISG50's packet flow. • Section 6.6 on page 97 identifies the features you should configure before and after you configure the main screens for each feature. For example, if you want to configure a trunk for load-balancing, you should configure the member interfaces before you configure the trunk. After you configure the trunk, you should configure a policy route for it as well. (You might also have to configure criteria for the policy route.) • Section 6.7 on page 103 identifies the objects that store information used by other features. • Section 6.8 on page 104 introduces some of the tools available for system management. 6.1 PBX Features Overview This chapter is an overview of different logical components and how they work together to route calls on the ISG50. 6.1.1 Call Routing The two main functions of any IP-PBX are routing internal calls and handling calls to and from the outside world. The following sections explain how these functions are performed on the ISG50. 6.1.1.1 Call Routing Terms The following are some terms related to ZyXEL's IP-PBX implementation. • Extension - This is a unique number assigned to each telephone connected to the ISG50. Extensions are used to make calls between phones connected to the ISG50 and to route calls from the outside world to their correct target. Extensions fall into the following two groups: • SIP Extension - This is an extension assigned to a SIP (Session Initiation Protocol) based IP phone connected to the ISG50. Alternatively this could be an extension assigned to an analog phone which connects to the ISG50 via a VoIP gateway device. ISG50 User's Guide 87
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