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TAPI Is Not Terminal Services Aware


View products that this article applies to.

Symptoms

Programs that control telephone systems through a serial interface (COM port) may not work when using Terminal Services.

Even though you can redirect a COM port to the client in the user session, a Telephony Application Programming Interface (TAPI) Telephone Service Provider (TSP) cannot access the COM port.

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Cause

This problem occurs because TAPI and the TSPs run as services in Windows 2000 and TSPs cannot access COM ports that are mapped in a user session. Therefore, the services run in a different logon session than the user programs.

Redirected COM ports are mapped in the per-session object name space. For more information about this behavior, view the section about "Kernel Object Name Spaces" in the "Platform SDK: Terminal Services" Microsoft Developer Network (MSDN) chapter.

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Status

Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section of this article.

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More information

Because of the infrastructure in the TAPI architecture, a TSP cannot be Terminal Services aware. There is no existing way to implement a TSP that is Terminal Services aware.

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Keywords: kbenv, kbprb, KB308405

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Article Info
Article ID : 308405
Revision : 9
Created on : 1/31/2007
Published on : 1/31/2007
Exists online : False
Views : 178