ZyXEL Communications ISG50 User Manual
ISG50 User’s Guide
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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.
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.
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
27.1.1 What You Can Do in this Chapter
.
• 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
.
• 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
• 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
PSTN
ITSP
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B
C
D
E
F
/ISDN
ISG