Aastra OpenCom 130 User Guide - Page 15
Packet Data in the D Channel, Telephony, Extended, Internet Access, Terminal Endpoint Identifier.
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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