Server; Chapter 6 Server; Overview - ZyXEL Communications X6004 User Manual

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6.1 Overview

This chapter shows you how to set up your X6004 SIP server settings on the
X6004. It also covers parameters for FXO/FXS, ISDN BRI/PRI channels, call
blocking settings, feature codes and email settings.
The following diagram shows SIP devices communicating with the X6004. 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 X6004 before they
are able to make calls via the X6004. The X6004 also is a client in relation to the
SIP server located at the ITSP (F). The X6004 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 X6004 (E) in the figure
below. In this case, both X6004s must register with each other before they can
forward each other's calls.
Figure 51 SIP Devices and the X6004
X6004 User's Guide
ITSP
PSTN
/ISDN
F
A
B

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D
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