Microsoft KB Archive/173528

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The information in this article applies to:


 * Microsoft Windows NT Workstation version 4.0
 * Microsoft Windows NT Server version 4.0

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

There is no dial tone.

CAUSE
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.

RESOLUTION
To resolve this problem, do either of the following:


 * Reduce the length of the dial string.

-or-
 * Use a different modem type.

MORE INFORMATION
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