What does HRESULT 0x00EF00C8 (RTC_E_STATUS_SUCCESS) mean?

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Description: OK

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RTC_E_STATUS_SESSION_PROGRESS	DXGI_STATUS_OCCLUDED

RTC_E_STATUS_SUCCESS

Operational meaning: `RTC_E_STATUS_SUCCESS`

This result should be investigated at the point where RTC handles the RTC Client API result wrapper around a final SIP success response, and the condition to prove for this HRESULT is the requested SIP method completed successfully at the responding user agent or server.

This result is represented as 0x00EF00C8 in the RTC SIP-status facility carrying status 200; for this HRESULT, record the symbolic name alongside the unsigned hexadecimal value; a decimal exception alone is poor evidence for RTC protocol diagnosis.

A defensible diagnosis of this result requires you to verify the method-specific output, especially Contact bindings or an SDP answer; in the case, a 200 response completes a transaction but does not by itself prove media reachability or application-level completion.

Signals worth preserving

Capture the first result before retry, reconnect, profile re-enable, or teardown changes the evidence; associate this result with one RTC object generation and one transaction or media transition.

Code-specific proof for this HRESULT: verify the method-specific output, especially Contact bindings or an SDP answer.
Correlation key for this HRESULT: resulting RTC session state.
Protocol or object snapshot for this HRESULT: SIP method and Request-URI.
Last completed transition for this HRESULT: Call-ID, CSeq and dialog tags.
Expected output for this HRESULT: final response headers.

Sanitize the result evidence before storage: secrets and user content should disappear, while framing, domains, sizes, hashes, timing, and object-state changes remain available for reproduction.

Protocol and object boundary

RTC area	successful `SIP` transaction completion
Condition to prove	the requested `SIP` method completed successfully at the responding user agent or server
Objects to correlate	RTC session, `SIP` client transaction, final response, negotiated session state
Safe corrective direction	advance the RTC state machine once, acknowledge when required, and validate negotiated output before reporting end-to-end success

The API and protocol context for this HRESULT is not optional: A 200-class SIP response is final for the transaction, but the application still has to validate the method-specific result and any returned session description; the related it control-flow rule is that The HRESULT severity is success; code that tests only whether the numeric value is zero can nevertheless discard the SIP status embedded in the facility.

Verification workflow

Start from 0x00EF00C8 and it, 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 verify the method-specific output, especially Contact bindings or an SDP answer.
keep the analysis at the right boundary: a 200 response completes a transaction but does not by itself prove media reachability or application-level completion.
after you advance the RTC state machine once, acknowledge when required, and validate negotiated output before reporting end-to-end success, repeat the smallest reproducer rather than restarting the entire application environment.

Use RTC event state to interpret the protocol trace for this HRESULT, and use the trace to verify what left or reached the host; for this HRESULT, this two-sided correlation identifies the producing layer.

Do not confuse it with

The practical separator for this HRESULT is this: provisional responses such as 180 or 183 report progress and do not complete the INVITE transaction; for this HRESULT, compare that boundary with these related RTC values.

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

Recovery and control flow

Recovery from it should be narrow: advance the RTC state machine once, acknowledge when required, and validate negotiated output before reporting end-to-end success; 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: An INVITE receives 200 with an SDP answer; the client sends ACK and then verifies that the selected terminals receive media.

Actions that do not address this condition

An investigation should not do not equate a final signaling success with verified two-way media.
Do not send the same non-idempotent request again merely because the wrapper expected S_OK.
A wrapper handling it should retain the original HRESULT instead of replacing it with an undifferentiated call failure.

Verification after a fix

A regression test for this HRESULT should reproduce “the requested SIP method completed successfully at the responding user agent or server” with the smallest profile, message, session, presence, media, or PINT fixture; for this HRESULT, assert 0x00EF00C8, the responsible method/event, and the object state after the result; then, for this HRESULT, change only the decisive precondition and verify that the corrected run leaves no stale transaction or RTC object.

Technical references

Microsoft RTC return constants — authoritative context for the boundary.
SIP final responses — definitions relevant when reproducing it.
SDP offer/answer model — API or protocol rules used to interpret it.

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