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TAPI_E_ADDRESSBLOCKED
What TAPI_E_ADDRESSBLOCKED means
TAPI_E_ADDRESSBLOCKED The provider or telephony policy blocks calls to the requested destination.
What to check
- Record the normalized destination after dial-plan processing, not only the user-entered text.
- Check provider restrictions, class-of-service rules, and enterprise dialing policy for that address.
- Compare with a permitted destination using the same account and line.
Handling
Use an allowed destination or change the governing policy through the supported administrative path. Retrying the blocked number unchanged is not useful.
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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