Telephony (TapiSrv) Service Defaults in Windows 8

Provides Telephony API (TAPI) support for programs that control telephony devices 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
Object:NT AUTHORITY\NetworkService
Path:%SystemRoot%\System32\svchost.exe -k NetworkService
File:%SystemRoot%\System32\tapisrv.dll
Registry key:HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\TapiSrv
Privileges:
  • SeAuditPrivilege
  • SeChangeNotifyPrivilege
  • SeCreateGlobalPrivilege
  • SeImpersonatePrivilege
  • SeIncreaseQuotaPrivilege
  • SeAssignPrimaryTokenPrivilege

Default Behavior

Telephony is a Win32 service. In Windows 8 it will not be started until the user starts it. When the Telephony service is started, it runs as NT AUTHORITY\NetworkService in a process of svchost.exe, sharing it with other services. If Telephony fails to start, the error details are added to Windows 8 error log. When the operating system startup is complete, the user is being notified that the TapiSrv service hasn't been started.

Dependencies

Telephony can't start, if the Remote Procedure Call (RPC) service is disabled or not available.

All the services listed below will not start if Telephony is disabled:

Restore Default Startup Configuration for Telephony

1. Select your Windows 8 edition and update pack, and then click Download.

2. Save the Win8_TapiSrv_Service_Startup.cmd file to a local storage device.

3. Run the saved file as an administrator.

4. Restart the computer.

The TapiSrv service is using the tapisrv.dll file that is located in the %WinDir%\System32 folder. If the file is corrupted or deleted, you can put it back in there.