Mitel 5760 VC User Manual page 56

Chapter 4 Network Configuration
In the H.323 tab, choose to register the 5760 VC in a 5700 VFA or in an H.323
Gatekeeper.
None;
Gatekeeper;
5700 VFA
5700 VFA Admin.
IP
Gatekeeper IP
User Number
NAT IP
4-6
To register with the 5700 VFA or a Gatekeeper, select the
appropriate option. Select None to operate the 5760 VC
outside of the control of one of these devices.
Enter the IP address of the 5700 VFA, if applicable.
Enter the IP address of the Gatekeeper, if applicable.
Videoconferencing contacts registered with the same 5760
VC or other Gatekeepers will be able to reach you through
your User Number as well as your IP address. See "Calling
Other Registered Users" on page 9-3 for more details.
Enter a number to register 5760 VC with the 5700 VF or
Gatekeeper. Some of these devices may register your
device under this number, while others assign these
numbers, regardless of your request.
If your organization uses NAT (Network Address
Translation) when communicating with parties in another
LAN or WAN, type the external address for your 5760 VC
device.
NAT helps protect a LAN from exposure to unwanted
traffic by providing one single external address to remote
users. NAT uses a system of local and external addresses
to hide a LAN's users from other networks. A NAT server
translates local parties' addresses to an external address,
which is then used to identify the local party to remote
parties. Therefore, remote parties use this external address
to call the local party, without knowing its actual local
address.
Mitel Networks 5760 VC User's Guide