RAS Callback Via ISDN Uses Only One Channel

 Last reviewed: August 22, 1996
Article ID: Q126383
The information in this article applies to:
  • Microsoft Windows NT Workstation version 3.5
  • Microsoft Windows NT Server version 3.5

SYMPTOMS

If you use the callback feature of the Windows NT 3.5 Remote Access Service (RAS) server to perform a callback through an ISDN connection, only one channel of the ISDN line is used.

CAUSE

An ISDN line provides two b-channels that can be used for data transfer. You can configure RAS to use two channels for dial-in to a Windows NT 3.5 RAS server. However, even if the RAS client is able negotiate the RAS connection with two channels, the RAS server only uses one channel for a callback (when the callback security feature is enabled).

STATUS

Microsoft has confirmed this to be a problem in Windows NT version 3.5. This problem has been corrected in the latest U.S. Service Pack for Windows NT version 3.5. For information on obtaining the Service Pack, query on the following word in the Microsoft Knowledge Base (without the spaces): 

   S E R V P A C K

KBCategory: kbnetwork kbbug3.50 kbfix3.50.sp3
KBSubcategory: ntras
Additional reference words: 3.50 prodnt

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Last reviewed: August 22, 1996
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