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TAPI_E_INVALLOCATION
What TAPI_E_INVALLOCATION means
TAPI_E_INVALLOCATION The dialing-location identifier is not valid for the current TAPI configuration.
What to check
- Read the current location list and confirm that the configured location ID still exists.
- Check whether the user profile, country/area settings, or telephony configuration changed.
- Verify that a saved ID was not copied from another machine or user profile.
Handling
Select a valid current dialing location and persist the new identifier only in the scope where it is valid.
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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