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12.   Using NDIS
 
175
This section describes the remedies for a few errors which could occur while 
operating the NDIS WAN CAPI Device Driver for Windows NT.
Symptom: CAPI applications which accept incoming data calls (with the 
ISDN service indicator DATA64K) do not work alongside the NDIS WAN 
CAPI Device Driver for Windows NT and the RAS Server mode.
Cause: Both the NDIS WAN CAPI Device Driver for Windows NT and the 
other CAPI applications are attempting to answer the same incoming calls.
Remedy: Because the incoming calls for the CAPI applications and the RAS 
both have the same service indicator, they can only be distinguished by 
assigning them different Multiple Subscriber Numbers (MSNs, on DSS1 lines). 
To assign an MSN, proceed as follows:
Configure an MSN (on a DSS1 line) for the NDIS WAN CAPI Device Driver 
for Windows NT. To do this, open the Network Settings (Start -> Settings -> 
Control Panel -> Network
) and click the Network Adapter tab. Select the 
NDIS WAN CAPI Device Driver in the list and click Properties. The NDIS 
WAN CAPI Device Driver for Windows NT properties window opens, and 
you can enter one of your ISDN line's MSNs.
Symptom: PPP connections fail.
Cause: The Windows NT RAS Service uses PPP over ISDN in accordance with 
RFC 1618. This protocol is also referred to as “synchronous PPP”, and is a 
widely-used standard for network connections over ISDN.
Remedy: The remote computer or Internet provider must also support this 
standard. You will find further information in the Word document 
STRUCTUR.DOC, which contains the specifications for the NDIS WAN CAPI 
Device Driver for Windows NT.
Remedy: The remote computer or Internet provider must also support this 
standard. You will find further information in the Word document 
STRUCTUR.DOC, which contains the specifications for the NDIS WAN CAPI 
Device Driver for Windows NT.
Cause: CompuServe does not use the standard PPP over ISDN (RFC 1618).
Remedy: Use a fossil device driver (such as cFos/NT) that provides a suitable 
modem emulation.
Legal notice
The AVM NDIS WAN CAPI Device Driver for Windows NT is commercial 
software owned by AVM Computersysteme Vertriebs GmbH, which provides the 
software free of charge for use by its customers.
The AVM NDIS WAN CAPI Device Driver for Windows NT and accompanying 
documentation may not be offered, used, altered, or marketed, nor may any of its 
identifying characteristics be altered, as part of offerings by third parties, such as 
hardware and software manufacturers, without written permission from AVM 
Computersysteme Vertriebs GmbH. Bundling with hardware or software not 
manufactured by AVM is expressly prohibited. Reverse engineering of the AVM 
NDIS WAN CAPI Device Driver for Windows NT, in whole or in part, is not 
permitted.
ISDNmst.fm  Page 175  Wednesday, January 15, 2003  9:22 AM