ZyXEL ISG50-PSTN User Guide - Page 429
Global PBX Settings
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CHAPTER 27 Global PBX Settings 27.1 Overview This chapter shows you how to set up your ISG50-wide PBX settings including SIP server, feature code, email, fake IP, peer to peer, QoS and TAPI settings. The following diagram shows SIP devices communicating with the ISG50. In SIP some devices act as clients and others as servers. For example, in the figure below, devices A-D act as clients and must register with the ISG50 before they are able to make calls via the ISG50. The ISG50 also is a client in relation to the SIP server located at the ITSP (F). The ISG50 must register with the ITSP SIP server before calls can be routed to telephones outside its network. Finally, two SIP servers can act as peers, as shown with another ISG50 (E) in the figure below. In this case, both ISG50s must register with each other before they can forward each other's calls. Figure 277 SIP Devices and the ISG50 ITSP E PSTN /ISDN F ISG D A B C 27.1.1 What You Can Do in this Chapter • Use the SIP Server screen to configure ISG50's general SIP server settings. See Section 27.2 on page 431. • Use the Feature Code screen to configure feature code settings. It allows users to dial a code on their phone's keypad to enable or disable a feature your ISG50 supports. See Section 27.3 on page 433. • Use the E-Mail screen to configure email settings. It allows users to send voice mails or CDR backup data through the email server. See Section 27.4 on page 435. • Use the Fake IP screen to configure settings that may help you to avoid any potential VoIP problems that result from having the ISG50 behind a NAT router. See Section 27.5 on page 435. ISG50 User's Guide 429
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