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RTC_E_STATUS_CLIENT_REQUEST_TIMEOUT
Where the state changes: RTC_E_STATUS_CLIENT_REQUEST_TIMEOUT
This result marks a specific boundary in a peer, proxy, registrar, or gateway returning a specific SIP response to the RTC transaction: the server could not produce a response within its transaction timing window; treating it as a generic RTC failure loses the state needed to choose a safe next action.
For correlation, retain 0x80EF0198 in the RTC SIP-status facility carrying status 408 together with this result; for this HRESULT, generic HRESULT text can otherwise hide the protocol family and the exact RTC branch.
The quickest way to localize this result is to correlate server response time with client transaction timers, retransmissions, and downstream reachability; the important the boundary is that a received 408 is a server decision; RTC_E_SIP_TIMEOUT can also originate locally when no final response arrives.
Telemetry and packet evidence
Do not wait for a generic failure notification to log this result; 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: correlate server response time with client transaction timers, retransmissions, and downstream reachability.
- Addressing context for this HRESULT: responding Via hop.
- RTC callback state for this HRESULT: Call-ID/CSeq/tags.
- Transaction boundary for this HRESULT: status-specific headers.
- Media or profile detail for this HRESULT: retry or alternate-target decision.
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.
Step-by-step isolation
- Start from
0x80EF0198and it, then find the method/event pair that first exposed it. - the proof step is to correlate server response time with client transaction timers, retransmissions, and downstream reachability.
- check whether the failure was local before transmission, produced during RTC state validation, or mapped from a remote response.
- keep the analysis at the right boundary: a received 408 is a server decision;
RTC_E_SIP_TIMEOUTcan also originate locally when no final response arrives. - after you retry only after checking method idempotency, downstream state, and any Retry-After guidance, 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 server could not produce a response within its transaction timing window |
| Objects to correlate | SIP request method, client transaction, response status, dialog identifiers and method-specific headers |
| Safe corrective direction | retry only after checking method idempotency, downstream state, and any Retry-After guidance |
The API and protocol context for this HRESULT is not optional: 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; the related it control-flow rule is 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.
Remediation boundary
Recovery from it should be narrow: retry only after checking method idempotency, downstream state, and any Retry-After guidance; while handling it, do not let a higher layer simultaneously recreate the same session, registration, listener, or profile.
Distinguish local rejection from an operation that may already have reached the server; for this HRESULT, use transaction identifiers and final events before replaying any non-idempotent action.
Example for this HRESULT: A proxy returns 408 after the next hop fails to answer the forwarded INVITE.
Comparison with adjacent codes
The practical separator for this HRESULT is this: local transaction timeout may occur without any SIP response from the peer; for this HRESULT, compare that boundary with these related RTC values.
RTC_E_STATUS_CLIENT_UNSUPPORTED_MEDIA_TYPE | the server does not support the media type or encoding of the request body |
|---|---|
RTC_E_STATUS_CLIENT_CONFLICT | the legacy RTC peer reported a conflict with current resource or transaction state |
RTC_E_STATUS_GLOBAL_NOT_ACCEPTABLE | the user cannot accept the proposed session at any location because its characteristics are globally unacceptable |
Keeping it separate from these neighbors improves both user messaging and automated retry policy.
Actions that do not address this condition
- With it, do not show a reason phrase as trusted server identity or authorization evidence.
- also do not retry every 4xx or 5xx response with the identical request.
- Do not discard the result facility and state boundary when converting the result into application telemetry.
Verification after a fix
Keep two tests: one that intentionally produces “the server could not produce a response within its transaction timing window”, and one that applies the narrow correction; for this HRESULT, check the callback sequence, 0x80EF0198, final session/profile state, and absence of leaked listeners, dialogs, streams, or registrations.
Technical references
- Microsoft RTC return constants — API or protocol rules used to interpret it.
- SIP response semantics — authoritative context for the boundary.
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