| Previous | Next |
| OLE_E_CLASSDIFF | OLE_E_CANT_GETMONIKER |
TAPI_E_COMPLETIONOVERRUN
Too many TAPI call completions are outstanding
TAPI_E_COMPLETIONOVERRUN is HRESULT 2147745800 (0x80040008) from TAPI 3.0. AllStat describes it as “Too many call completions outstanding.” The result belongs to registration or use of call-completion requests such as callback or camp-on. The symbol this result is useful only when tied to the method and lifecycle phase where the provider has reached its limit for pending completion operations.
The decisive meaning of this result is that the provider has reached its limit for pending completion operations. The severity bit does not decide handling; the controlling fact is that the provider has reached its limit for pending completion operations. A reliable it diagnosis preserves the raw value and reconstructs the state that made this true: the provider has reached its limit for pending completion operations.
Where the result appears
- This result can surface in a TAPI 3 address, call-control, terminal, stream, conference, dialing, or completion-management code.
- map the failure to one concrete operation among ITTAPI, ITAddress, ITBasicCallControl, ITCallInfo, terminal and stream interfaces, provider events, and asynchronous request state.
- Preserve provider name and version, address and call IDs, device class, media type, privilege, current address and call states, and asynchronous request ID before releasing or replacing the object that returned this result.
An incident record for this HRESULT must distinguish caller, runtime, provider, and backing resource while testing whether the provider has reached its limit for pending completion operations.
Typical causes and interpretation boundary
The immediate contract boundary is specific: the provider has reached its limit for pending completion operations. Common cause branches include the following:
- The application does not cancel obsolete completions.
- Many users request callback simultaneously.
- Completion notifications are not consumed and released.
Confirm the cause branch that explains why the provider has reached its limit for pending completion operations by using call arguments, object state, metadata, device information, or provider traces.
Correct handling and recovery
The primary recovery is to enumerate or track outstanding completions, cancel stale requests, and submit new ones only when capacity is available. The result failure report should expose enough registration or use of call-completion requests such as callback or camp-on state to understand why the provider has reached its limit for pending completion operations without a production debugger.
The owner of it must define idempotency, cancellation, attempt limits, and reconciliation for the failed registration or use of call-completion requests such as callback or camp-on. Reconcile persistent, remote, device, or ownership state before repeating it.
Practical scenario
A call-center client registers callback requests after every busy call but never cancels old entries, eventually reaching the provider limit. Record the decisive state for this HRESULT and verify recovery on a fresh object or request generation.
Difference from related HRESULTs
TAPI_E_INVALCOMPLETIONID rejects a specific ID; it reports exhaustion of completion capacity Tests and telemetry should preserve that boundary for this HRESULT.
Developer and administrator guidance
Developers handling it should make object lifetime and state transitions explicit, preserve the native HRESULT, and keep cleanup paths safe when initialization or output is partial. Use a controllable service provider or simulator to cover state races, capability differences, device removal, cancellation, and provider restart.
Broad permission or compatibility changes are inappropriate unless evidence for the provider has reached its limit for pending completion operations points to that layer. Repair for this HRESULT should target only the evidence-backed component, provider, document, device, or configuration.
References
- Microsoft: TAPI_E constants
- Microsoft: ITAddress::CreateCall
- Microsoft: ITBasicCallControl
- Microsoft: TAPI 3 reference
Looking for a different code? Search another status or error code.