Features
13
SAPI 16) can also be established between several S
0
interfaces of the
OpenCom 100. Simultaneous connections are distinguished by means of a TEI
(Terminal Endpoint Identifier).
X.31 packet data can be forwarded between two S
0
interfaces (for instance an
internal and external S
0
interface). Equally, data can be forwarded (“routed”) over
permanent QSIG lines. Data can also be routed over an S
2M
interface. It is possible
to operate multiple terminals with the same TEI on different internal S
0
interfaces.
A TEI mapping table allows these X.31 connections to be routed to the same
external S
0
interface.
The routing table for X.31 packet data is set in the Configurator under
PBX Configuration
:
X.31
. Additional information can be found in the Configu-
rator online help files.
Internet Access
It is possible to connect individual PCs to the OpenCom 100 via the internal S
0
ports, or to connect an entire LAN to the OpenCom 100 via the Ethernet port.
These PCs can access the Internet via the OpenCom 100. If Internet access is
already available from an Internet service provider, this can be configured in the
OpenCom 100. If the client network is not IP-capable, the OpenCom 100 can admi-
nister the IP configuration necessary for Internet access. The OpenCom 100 has an
integrated DHCP server and a DNS server, which in this case take over IP address
administration and name resolution for the client PCs.
The OpenCom 100 enables Internet access for all connected PCs by means of a
common IP address. Only this is externally visible. The local IP addresses of the
client PCs are translated to the IP address of the OpenCom 100 by network address
translation (NAT). In this way the client PCs in the LAN cannot be reached directly
from the Internet. This protects them from direct external attack. The LAN is additi-
onally protected by the OpenCom 100 filter lists, which can be customised indivi-
dually (firewall function).
Note:
We recommend you to read through the explanati-
ons under
Useful Information on Internet Access
starting on
page 96.
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