\registry\machine\software\microsoft\windows
\registry\machine\software\microsoft\windows\currentversion
\registry\machine\software\microsoft\windows\currentversion\Telephony
    TapisrvDebugLevel = REG_DWORD 0
    Tapi32DebugLevel = REG_DWORD 0
    KmddspDebugLevel = REG_DWORD 0
    Atsp32DebugLevel = REG_DWORD 0

\registry\machine\software\microsoft\windows\currentversion\Telephony\Providers
    NumProviders = REG_DWORD 3
    NextProviderID = REG_DWORD 4
    ProviderID0 = REG_DWORD 1
    ProviderID1 = REG_DWORD 2
    ProviderID2 = REG_DWORD 3
    ProviderFilename0 = REG_SZ kmddsp.tsp
    ProviderFilename1 = REG_SZ esp32.tsp
    ProviderFilename2 = REG_SZ atsp32.tsp

\registry\machine\software\microsoft\windows\currentversion\Telephony\Provider1
    NumLines = REG_DWORD 0
    NumPhones = REG_DWORD 0

\registry\machine\software\microsoft\windows\currentversion\Telephony\Provider2
    NumLines = REG_DWORD 0
    NumPhones = REG_DWORD 0

\registry\machine\software\microsoft\windows\currentversion\Telephony\Provider3
    NumLines = REG_DWORD 0
    NumPhones = REG_DWORD 0