Aastra OpenCom 131 User Guide - Page 15

Packet Data in the D Channel, Telephony, Extended, Internet Access, Terminal Endpoint Identifier.

Page 15 highlights

Features Further information regarding these configuration options can be found in the chapters PBX Cascading starting on page 148 and PBX Networking starting on page 153. Packet Data in the D Channel Some business applications, for instance POS terminals, cash registers or credit card terminals, require a permanent data connection over the X.25 packet data network. Packet data transfer through the ISDN D channel (according to X.31 via SAPI 16) can also be established between several S0 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 S0 interfaces (for instance an internal and external S0 interface). Equally, data can be forwarded ("routed") over permanent Q.SIG lines. Data can also be routed over an S2M interface. It is possible to operate multiple terminals with the same TEI on different internal S0 interfaces. A TEI mapping table allows these X.31 connections to be routed to the same external S0 interface. The routing table for X.31 packet data is set in the Configurator under Telephony: Extended: X.31. Additional information can be found in the Configurator online help files. Internet Access It is possible to connect individual PCs to the OpenCom 100 via the internal S0 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 administer 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 additionally protected by the OpenCom 100 filter lists, which can be customised individually (firewall function). 13

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Features
13
Further information regarding these configuration options can be found in the
chapters
PBX Cascading
starting on page 148 and
PBX Networking
starting on
page 153.
Packet Data in the D Channel
Some business applications, for instance POS terminals, cash registers or credit
card terminals, require a permanent data connection over the X.25 packet data
network. Packet data transfer through the ISDN D channel (according to X.31 via
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 Q.SIG 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
Telephony
:
Extended
:
X.31
. Additional information can be found in the Configurator 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
administer 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 addi-
tionally protected by the OpenCom 100 filter lists, which can be customised indi-
vidually (firewall function).