DOCUMENT:Q237968 20-MAY-2002 [winnt] TITLE :RAS Configuration May Change When Installing Multiple ISDN Cards PRODUCT :Microsoft Windows NT PROD/VER:winnt:4.0 OPER/SYS: KEYWORDS:kbWinNT4sp6fix ====================================================================== ------------------------------------------------------------------------------- The information in this article applies to: - Microsoft Windows NT Server version 4.0, Terminal Server Edition - Microsoft Windows NT Server version 4.0 - Microsoft Windows NT Server, Enterprise Edition version 4.0 - Microsoft Windows NT Workstation version 4.0 ------------------------------------------------------------------------------- SYMPTOMS ======== When you install multiple TAPI devices on the same computer, such as ISDN PRI cards, the RAS configuration specified for the port could change. Typically, the problem occurs when you install two ISDN cards of the same type on the computer. CAUSE ===== The problem occurs because the device list is maintained in descending order in the registry. When NdisWan.sys initializes, it registers the second adapter before registering the first adapter with TapiServ. This causes the addresses and names to get swapped. RESOLUTION ========== Windows NT Server or Workstation 4.0 ------------------------------------ To resolve this problem, obtain the latest service pack for Windows NT 4.0 or the individual software update. For information on obtaining the latest service pack, please go to: - http://www.microsoft.com/Windows/ServicePacks/ -or- - Q152734 How to Obtain the Latest Windows NT 4.0 Service Pack For information on obtaining the individual software update, contact Microsoft Product Support Services. For a complete list of Microsoft Product Support Services phone numbers and information on support costs, please go to the following address on the World Wide Web: http://support.microsoft.com/default.aspx?scid=fh;EN-US;CNTACTMS Windows NT Server 4.0, Terminal Server Edition ---------------------------------------------- To resolve this problem, obtain the latest service pack for Windows NT Server 4.0, Terminal Server Edition. For additional information, please see the following article in the Microsoft Knowledge Base: Q152734 How to Obtain the Latest Windows NT 4.0 Service Pack STATUS ====== Microsoft has confirmed this to be a problem in Windows NT 4.0 and Windows NT Server 4.0, Terminal Server Edition. This problem was first corrected in Windows NT Server 4.0 Service Pack 6 and Windows NT Server 4.0, Terminal Server Edition Service Pack 6. MORE INFORMATION ================ Some ISDN adapters, such as USR PRI ISDN cards, have multiple channels on the same card. USR PRI has 23 channels. When the first card is installed, the first channel of the first adapter is mapped to the RAS port ISDN1, the second to ISDN2, and so forth. When the second card is installed, the first channel of the second adapter is mapped to the ISDN24, second to ISDN25 and so on. The ports can be configured for "Receive calls as a RAS server" or "Dial out as a RAS client". However, when you restart the computer, the ports are remapped. The new configuration maps the first channel on the first adapter to ISDN24, the second channel becomes ISDN25, and so forth. The first channel on the second adapter becomes ISDN1, the second becomes ISDN2, and so forth. This affects the RAS configuration assigned to the particular port/channel. If all the channels on the first card are originally configured for dial-out only (client), and all the channels on the second card are configured for receive only (server), after you restart, they are swapped such that all the channels on the first card now are configured for receive only, and the second card for dial-out only. Before restart: Port Address 6-23-0 6-22-0 .....6-1-0 4-23-0 4-22-0 ... 4-1-0 Friendlyname ISDN46 ISDN45 .....ISDN24 ISDN23 ISDN22 ... ISDN1 Role Server Server .....Server Client Client ... Client After restart: Port Address 6-23-0 6-22-0.....6-1-0 4-23-00 4-22-0 ... 4-1-0 Friendlyname ISDN23 ISDN22.....ISDN1 ISDN46 ISDN45 ... ISDN24 Role Server Server.....Server Client Client ... Client Additional query words: ====================================================================== Keywords : kbWinNT4sp6fix Technology : kbWinNTsearch kbWinNTWsearch kbWinNTW400 kbWinNTW400search kbWinNT400search kbWinNTSsearch kbWinNTSEntSearch kbWinNTSEnt400 kbWinNTS400search kbWinNTS400 kbNTTermServ400 kbNTTermServSearch Version : winnt:4.0 Hardware : ALPHA x86 Issue type : kbbug Solution Type : kbfix ============================================================================= THE INFORMATION PROVIDED IN THE MICROSOFT KNOWLEDGE BASE IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND. MICROSOFT DISCLAIMS ALL WARRANTIES, EITHER EXPRESS OR IMPLIED, INCLUDING THE WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT SHALL MICROSOFT CORPORATION OR ITS SUPPLIERS BE LIABLE FOR ANY DAMAGES WHATSOEVER INCLUDING DIRECT, INDIRECT, INCIDENTAL, CONSEQUENTIAL, LOSS OF BUSINESS PROFITS OR SPECIAL DAMAGES, EVEN IF MICROSOFT CORPORATION OR ITS SUPPLIERS HAVE BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES. SOME STATES DO NOT ALLOW THE EXCLUSION OR LIMITATION OF LIABILITY FOR CONSEQUENTIAL OR INCIDENTAL DAMAGES SO THE FOREGOING LIMITATION MAY NOT APPLY. Copyright Microsoft Corporation 2002.