Polycom 4300T Benutzerhandbuch

 Configuring the 4300T

3 - 5

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

PSTN

EM004