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TAPI_E_NOFORMAT
What TAPI_E_NOFORMAT means
TAPI_E_NOFORMAT The provider does not recognize or support the requested media format.
What to check
- Record the exact media format, subtype, rate, channels, and stream/terminal involved.
- Enumerate formats accepted by the current provider or media service provider.
- Check whether the format was valid before renegotiation but not after a device or topology change.
Handling
Negotiate or convert to a format supported by the active provider. Keep the original format data so conversion does not hide the actual incompatibility.
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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