This network diagram shows an IP-PBX system connected to multiple LANs, routers, switches, and IP phones. The IP-PBX is connected through routers and switches to separate LANs housing IP phones with extension numbers 100-199, 200-299, 300-399, 400-499, and 500-599, 600-699.

1. Private
Network
Router
Switch
Router
Router
Router
SwitchSwitch
LAN LAN
LAN LAN
LAN
LAN
Co
Line
IP-Phone
IP-Phone
IP-Phone
IP-Phone
KX-TCA355
IP-Phone
Co
Line
Co
Line
LANIP-Phone
IP-Phone
IP-Phone
IP-Phone
IP-Phone
Other factory
PC
SIP-Phone
IP-PBX
Diagram By
IP-Phone
This system’s Extension number
100,~199,200~299
This system’s Extension number
300,~399,400~499
This system’s Extension number
500~599,600~699
IP-Phone
Other factory