Download Avaya BSGX4e User Guide

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The SIP Session Controller (SIP SC) controls VoIP telephones installed in the Local
Area Network (LAN). The SIP User Agent (SIP UA) controls the analog fax machine
attached to the FXS port of the BSGX4e.
Workstations installed in the LAN access various data services such as e-mail,
chat, and the World Wide Web.
VoIP traffic is protected from data traffic.
To configure the Quality of Service of the BSGX4e, you must understand how VoIP and data
flows go through the BSGX4e.
Figure 12 shows the logical path of flows
Traffic to WAN
Traffic from WAN
FW
L
A
N
Routing/
NAT
QoS
W
A
N
INTERNAL HOST
(SC, UA…)
Routing/
NAT
IDS
FW
Figure 12. Logical path
Flows are exchanged between three components: equipment located in LAN,
equipment located in Wide Area Network (WAN), and the internal host handling
services such as the Session Controller and the User Agent.
Traffic from the LAN goes through the Firewall (FW), Routing/NAT, and Quality of
Service (QoS). Traffic from the WAN goes through the Firewall, Intrusion Detection
System (IDS), and Routing/NAT. Traffic to the WAN is trusted so it does not need to
be checked by the Intrusion Detection System. Traffic from the WAN usually has a
low speed, so you do not need QoS. Figure 13 shows the hardware path of flows.
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BSGX4e Business Gateway User Guide
Release 01.01