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H A P T E R
This chapter shows you how to set up your SIP server settings on the X6004. It also covers
parameters for FXO/FXS channels, call blocking settings and feature codes.
7.1 SIP Server Overview
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 82 SIP Devices and the X6004
7.1.1 RTP
When you make a VoIP call using SIP, the RTP (Real Time Transport Protocol) is used to
handle voice data transfer. See RFC 1889 for details on RTP.
X6004 User's Guide
ITSP
PSTN
F
A
B
SIP Server
E
D
C
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