What does HRESULT 0x80EF0199 (RTC_E_STATUS_CLIENT_CONFLICT) mean?

Status / error code:		Category:

Constant name:
Source:	Operating System:
Description: Conflict

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RTC_E_STATUS_CLIENT_CONFLICT

Operational meaning: `RTC_E_STATUS_CLIENT_CONFLICT`

The operational meaning of this result is tied to a peer, proxy, registrar, or gateway returning a specific SIP response to the RTC transaction: the legacy RTC peer reported a conflict with current resource or transaction state.

The machine-readable identity of this result is 0x80EF0199 in the RTC SIP-status facility carrying status 409; the result identity matters because RTC uses separate facilities for API conditions, SIP final responses, and PINT service statuses.

The first useful check for this HRESULT is to capture the exact method, target object, responder implementation, and any extension body explaining the conflict; The result must be separated from nearby conditions because 409 is exposed by the legacy RTC mapping but lacks the broad current SIP semantics of standard codes such as 481 or 486.

Verification workflow

Start from 0x80EF0199 and this result, then find the method/event pair that first exposed it.
check whether the failure was local before transmission, produced during RTC state validation, or mapped from a remote response.
the proof step is to capture the exact method, target object, responder implementation, and any extension body explaining the conflict.
keep the analysis at the right boundary: 409 is exposed by the legacy RTC mapping but lacks the broad current SIP semantics of standard codes such as 481 or 486.
after you follow the deployed server contract, refresh object state, and avoid guessing from the HTTP status with the same number, repeat the smallest reproducer rather than restarting the entire application environment.

Correlate wire data and RTC events for this HRESULT; for this HRESULT, either source alone can misclassify local validation as remote rejection, or a remote status as a local media or profile failure.

Protocol and object boundary

RTC area	`SIP` final response boundary
Condition to prove	the legacy RTC peer reported a conflict with current resource or transaction state
Objects to correlate	`SIP` request method, client transaction, response status, dialog identifiers and method-specific headers
Safe corrective direction	follow the deployed server contract, refresh object state, and avoid guessing from the `HTTP` status with the same number

At the boundary, The facility code preserves the SIP status number; diagnosis should start with the method and responding hop rather than treating every value as a local COM failure; separately, this result must be read with the rule that Some responses invite a modified request or authenticated retry, while others are terminal for the current target or even global for the addressed user.

Signals worth preserving

Do not wait for a generic failure notification to log it; preserve the API call or event producing it together with the RTC object and transaction state visible at that moment.

Code-specific proof for this HRESULT: capture the exact method, target object, responder implementation, and any extension body explaining the conflict.
Correlation key for this HRESULT: Call-ID/CSeq/tags.
Protocol or object snapshot for this HRESULT: status-specific headers.
Last completed transition for this HRESULT: retry or alternate-target decision.
Expected output for this HRESULT: request method and Request-URI.

A useful it trace does not require communication content or secrets; in the result record, keep structural metadata and correlation identifiers while removing passwords, authorization material, complete numbers, and private presence data.

Recovery and control flow

Recovery from it should be narrow: follow the deployed server contract, refresh object state, and avoid guessing from the HTTP status with the same number; while handling it, do not let a higher layer simultaneously recreate the same session, registration, listener, or profile.

A retry after it is safe only after the prior transaction’s outcome is reconciled; after it, reissuing state-changing requests while the peer result is unknown can create contradictory RTC state.

Example for this HRESULT: A proprietary RTC service rejects a list update because its version conflicts with a newer server copy.

Actions that do not address this condition

The following shortcut is unsafe for this HRESULT: do not retry every 4xx or 5xx response with the identical request.
Do not show a reason phrase as trusted server identity or authorization evidence.
Do not translate it into a broad “connection failed” label before preserving the RTC symbol and producing phase.

Do not confuse it with

For this HRESULT, 481 has defined dialog/transaction-not-found meaning; 409 is implementation-specific in this legacy context; for this HRESULT, the neighboring results below require different control-flow decisions.

`RTC_E_STATUS_GLOBAL_BUSY_EVERYWHERE`	the user is busy at every known location and further branching should stop
`RTC_E_STATUS_CLIENT_LENGTH_REQUIRED`	the server requires an explicit Content-Length body framing it received
`RTC_E_STATUS_CLIENT_GONE`	the addressed SIP resource was known previously but is no longer available and no forwarding Contact is supplied

Telemetry for this HRESULT should retain these distinctions even when several outcomes share HRESULT severity.

Verification after a fix

Keep two tests: one that intentionally produces “the legacy RTC peer reported a conflict with current resource or transaction state”, and one that applies the narrow correction; for this HRESULT, check the callback sequence, 0x80EF0199, final session/profile state, and absence of leaked listeners, dialogs, streams, or registrations.

Technical references

Microsoft RTC return constants — definitions relevant when reproducing it.
SIP response semantics — API or protocol rules used to interpret it.

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