User Manual V2IU 4350 Converged Network Appliance
Configuration Guide For IP Centrex Applications
A typical 4350 installation for an IP Centrex application requires no external router or firewall. The 4350 WAN port is connected directly to the T1/E1 line and the LAN port(s) are connected directly to enterprise devices and/or Ethernet switches.
VoIP Operations Center
Softswitch | Application Server |
NMS | |
Gateway | T1 |
|
PSTN
PSTN
Enterprise | Enterprise |
T1/FT1 | T1/FT1 |
4350 | 4350 |
|
Gateway
EM003
VoIP signaling is performed in the service provider network via a softswitch and the 4350 acts as a proxy for the voice devices installed in the enterprise LAN. In this configuration a single public IP address is used to proxy for all of the IP phones and to route to multiple PC’s installed on the LAN.
The 4350 performs the following functions in this application:
•WAN/LAN IP routing.
•Traffic shaping and priority queuing to guarantee high quality voice traffic. These mechanisms protect voice and data traffic from contending for the same network resources to guarantee low latency and the highest call quality possible for VoIP traffic. At the same time they ensure the best utilization of WAN bandwidth by enabling data traffic to burst up to full line rate in the absence of voice calls. Precedence is automatically given to traffic coming from IP phones and other devices using the 4350’s Application Layer Gateway function.
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