Operation Manual

119 NT/MPRI – Glossary

ters such as spoofing mechanisms or channel bundling. Depending on

the configuration, the logical ISDN connection will either be cleared

down along with the physical one, or continue to exist if so agreed with

the remote site.

Metric

Metrics are abstract numbers used to evaluate routes. If multiple

routes are defined and available to a given destination, the NT/MPRI

selects the route with the lowest total metric value, this being classi-

fied as the “best route”.

MSN (Multiple Subscriber Number)

In Euro-ISDN (the D channel protocol DSS1), Multiple Subscriber Num-

bers serve to distinguish among several terminals on the same S

bus

(or between several CAPI applications on the same PC). Deutsche Tele-

kom AG assigns a standard ISDN line three Multiple Subscriber Num-

bers.

NCP (NetWare Core Protocol)

A protocol for managing communication between the client and the

server in a Novell network.

NetBIOS (Network Basic Input/Output System)

A standard for network communication which is independent of specif-

ic transport types. NetBIOS is the standard interface in Microsoft net-

works and can be transported over both IP and IPX. NetBIOS uses nu-

merous broadcasts, which can be intercepted by the NT/MPRI's filters

to reduce connection costs.

Network Address Translation (RFC 1631)

With NAT, the NT/MPRI keeps a table that maps external IP addresses

and port numbers to internal IP addresses and port numbers. In this

way incoming mail (SMTP) connections for example can be directed by

the NT/MPRI to specified hosts in the private LAN even if the Internet

connection uses a dynamically assigned IP address.

Outside Line Access

The Outside Line Access is the prefix dialed in a Private Branch Ex-

change (PBX) to obtain an outside line. This is usually “0”. Enter the

Outside Line Access for each ISDN-Controller into the NT/MPRI

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