Telephony (TapiSrv) Service Defaults in Windows XP

Provides Telephony API (TAPI) support for programs that control telephony devices and IP based voice connections on the local computer and, through the LAN, on servers that are also running the service.

Default Settings

Startup type: Manual
Display name:Telephony
Service name:TapiSrv
Service type:share
Error control:normal
Path:%SystemRoot%\System32\svchost.exe -k netsvcs
Registry key:HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\TapiSrv

Default Behavior

Telephony is a Win32 service. In Windows XP it won't start until the current user starts it. When the Telephony service is started, it is running as LocalSystem in a shared process of svchost.exe. Other services and drivers are allowed to run in the same process. If the Telephony fails to start, the technical information about the error is added to the Event Log. Windows XP startup should proceed, but a message box should be displayed informing the user that the TapiSrv service has failed to start.


Telephony depends on the following system components:

The following components depend on Telephony:

Restore Default Startup Configuration of Telephony

Before you begin doing this, make sure that all the services on which Telephony depends are configured by default and function properly. See the list of dependencies above.

1. Run the Command Prompt.

2. Copy the command below, paste it into the command window and press ENTER:

sc config TapiSrv start= demand

3. Close the command window and restart the computer.

The TapiSrv service is using the tapisrv.dll file that is located in the C:\Windows\System32 directory. If the file is removed or corrupted, read this article to restore its original version from Windows XP installation media.