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TAPI_E_INVALHOOKSWITCHDEV
What TAPI_E_INVALHOOKSWITCHDEV means
TAPI_E_INVALHOOKSWITCHDEV The hookswitch device identifier does not designate a valid hookswitch device for the selected phone.
What to check
- Enumerate the hookswitch devices exposed by the current phone object.
- Compare the rejected ID with the phone’s current capabilities.
- Check whether the phone was unplugged, reopened, or replaced after the identifier was cached.
Handling
Use a hookswitch device ID obtained from the active phone/provider instance and refresh device state after hardware changes.
References
- Microsoft: TAPI_E constants — official Microsoft documentation used to interpret the HRESULT.
- Microsoft: TAPI 3.1 Reference
- Microsoft: Telephony API interfaces
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