Polycom 4300T User Manual

Page 23

Configuring the 4300T

3 - 5

Configuration Guide For Station Side IP PBX Applications

Most private enterprise VoIP networks use an IP PBX at the corporate

headquarters location to provide voice switching between headquarters,

branch offices and the PSTN. The 4300T is used in these environments to

securely connect branch office employees to the IP PBX installed in the

corporate headquarters location.

The installation of an 4300T on the station side of an enterprise IP PBX is very

similar to the IP Centrex application above. The branch office is connected to

the corporate network using a private T1/E1 link connected directly to the

WAN port of the 4300T. The LAN port(s) of the 4300T are connected directly

to enterprise devices and/or Ethernet switches.
The IP PBX in the corporate headquarters location performs VoIP signaling

and the 4300T acts as a proxy for the voice devices installed at the branch

office. Please note that in the configuration the 4300T located at the

Headquarters location is acting as a WAN router only. The 4300Ts installed at

the brand offices perform the following functions in this application:

• WAN/LAN IP routing.

IP PBX

Gateway

4300T

PSTN

EM004

Headquarters

Branch Office

T1/FT1