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Microsoft KB Archive/173528

From BetaArchive Wiki

Dial-Up Networking Error: There Is No Dial Tone

ID: Q173528

The information in this article applies to:

  • Microsoft Windows NT Workstation version 4.0
  • Microsoft Windows NT Server version 4.0


When you dial one of your Dial-Up Networking phonebook entries, you may receive the following error:

There is no dial tone.


The dial string is greater than 40 characters; this causes it to be divided into two dial strings, which some modems do not interpret correctly.


To resolve this problem, do either of the following:

  • Reduce the length of the dial string.


  • Use a different modem type.


A predefined and hard-coded total limit of 34 dialing digits per dialing string is imposed within Dial-Up Networking on Windows NT. The 34-digit limit does not include the dialing prefix ATDT, nor suffixes (;), nor NULL characters.

When Dial-Up Networking encounters a dialing string with more than 34 dialing digits, it divides the string and sends the remaining digits in a second dialing string. Some modem brands only allow a single dialing string to be sent with each ATDT command, and any additional strings sent with a second ATDT command return the error above.

Additional query words: usr long phone number prodnt DUN ras

Keywords : kbnetwork ntras ntnetserv kbinfo NTSrvWkst
Version : winnt:4.0
Platform : winnt
Issue type : kbprb

Last Reviewed: February 10, 1999
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