Iwatsu ICON Series IX-5910 Owner's Manual page 133

The Iwatsu Enterprise 12i IP Telephone also requires an available channel
on an IX-MBU Media Bridge Unit card. The channel on the IX-MBU card is
used to communicate with TDM resources. Iwatsu Enterprise 12i to Iwatsu
Enterprise 12i and Iwatsu Enterprise 12i to other Iwatsu IP Telephone
(except IX-12IPKTD) calls are peer-to-peer and do not require an IX-MBU
channel. The Iwatsu Enterprise 12i may be installed on the internal LAN or
may access the Iwatsu Enterprise-CS system via a WAN connection. WAN
connections can be configured for VPN or Non-VPN routers. End-to-end
QoS is required for all VPN routers in the WAN.
The Iwatsu Enterprise 12i IP Telephone includes an integrated Layer 2
switch that was designed for the workstation user and allows the switching
of data within a LAN via MAC address. Because the Iwatsu Enterprise 12i
IP Telephone is a Layer 2 switch, one client PC can connect to the back of
the Iwatsu Enterprise 12i IP Telephone (via the PC jack) and then passes all
data through the phone. When using the switching capabilities of the Iwatsu
Enterprise 12i, voice quality may suffer. It is important to not use the
switching capabilities for high-load devices like a file or database server.
The Iwatsu Enterprise 12i Telephone packages voice data through the UDP
datagram and sends the data on an IP network such as an Ethernet LAN or
VPN. Additionally, the Iwatsu Enterprise 12i can be powered over the
Ethernet, via Power over Ethernet (PoE) Power Sourcing Equipment (PSE).
See Power over Ethernet in this section.
Iwatsu Enterprise 12i Platinum Series IP Telephone
Note: Remote stations will operate in both a VPN or non-VPN
environment (Internet mode). Internet mode allows up to 64 IP
stations to operate remotely without a VPN connection.
IP TELEPHONE USER GUIDE - 113