ESI IP 200 Installation Manual page 88

Function 8: IP PBX programming
Enter gateway's IP address
Although it can use a public IP address, the IP PBX will normally use private addressing and sit behind
some sort of address-translation device, such as a NAT
public IP address to the network on which the IP PBX resides is the gateway. This device's address
is often called the default gateway address.
For instance: a company's Dallas office uses DSL as its broadband connection, and the DSL line is
terminated at a DSL router that sits on the LAN. That router will have two interfaces: the WAN side,
which must have a public (globally-addressable) IP address, and the LAN side, which normally has
a private (non-routable) IP address. The private IP address on the LAN interface is the address that
is used in this programming step.
Note: The IP addresses of the IP PBX and the LAN interface do not necessarily have to be on the
same subnet.
Enter the IP address of the gateway's LAN interface in dotted-quad notation, using the # key as the
dot between the octets. Press # again when finished.
PBX GATEWAY IP
0.0.0.0
Enter remote-access IP address
The remote-access IP address is the address the Remote IP Feature Phone and other IP PBXs con-
nected via Esi-Link will use to access the local IP PBX. (If remote access to the IP PBX is not
planned, this parameter can be left at default.) If a gateway device is used to connect an IP PBX on
a private network to a public or WAN connection, the remote access IP address is the public or WAN
address of the gateway. If a public IP address is assigned as the PBX Private IP Address, the same
IP address will be entered here.
Enter the remote-access IP address in dotted-quad notation, using the # key as the dot between
the octets. Press # again when finished.
RMT ACCESS IP
0.0.0.0
Assign UDP port
UDP ports are used to provide security to the system; only traffic destined for a specific UDP port
will be allowed to pass through the gateway device. The administrator will choose a UDP port range
10000–65000, inclusive, but will enter only the first two digits of that range. For example, the
range of 10000–10999 would be entered as 10; the range of 56000–56999 would be entered as
56. The default is 59.
BASE UDP PORT
??000: 59
The IP PBX will automatically be assigned the first port in that range (in this example, 59001) and
the IP phones will automatically have their extension number appended to the first two digits (e.g.,
extension 123 will be assigned a UDP port of 59123). In fact, upon entering the second digit of the
base number (in this case, the 9), the display will automatically populate the remaining three
places in the number with the digits 001.
Press # when finished.
5
Network address translation.
K.2
IP Series Installation Manual
5
-enabled router. Whatever device provides a