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TAPI_E_USERUSERINFOTOOBIG
What TAPI_E_USERUSERINFOTOOBIG means
TAPI_E_USERUSERINFOTOOBIG The user-to-user information attached to the call exceeds the size permitted by TAPI or the provider.
What to check
- Measure the encoded byte length at the native API boundary.
- Check provider/network limits and whether character-set conversion expands the payload.
- Verify that headers or framing bytes are not accidentally included in the application payload length.
Handling
Reduce or split the user-user information according to the provider contract. Validate byte length before starting the call operation.
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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