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RTC_E_STATUS_SERVER_NOT_IMPLEMENTED
Operational meaning: RTC_E_STATUS_SERVER_NOT_IMPLEMENTED
The useful interpretation of this result is narrower than “SIP error”; within a peer, proxy, registrar, or gateway returning a specific SIP response to the RTC transaction, it means the server does not implement the SIP method needed.
The stored Value is 0x80EF01F5 in the RTC SIP-status facility carrying status 501; for this HRESULT, keep both forms in telemetry so COM error wrapping does not erase whether RTC produced an interface result, mapped a SIP response, or surfaced a PINT outcome.
Collect enough state to capture method, Server/User-Agent identity, Allow and Supported headers, and target role; the result evidence should demonstrate why Not Implemented is server-wide method capability; 405 means the method is disallowed for a particular resource.
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: capture method, Server/User-Agent identity, Allow and Supported headers, and target role.
- 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.
When recording this result, redact credentials, full telephone numbers, private contact lists, and message bodies; for this HRESULT, retain permitted URI domains, header names, byte counts, hashes, transaction identifiers, timestamps, and state transitions.
Recovery and control flow
The owning RTC component should use a supported feature path or different capable endpoint rather than repeating the same method; for this HRESULT, it should also settle or cancel its previous operation before callers begin a replacement.
Before retrying this result, classify the previous operation as definitely failed, definitely completed, or remotely uncertain; for this HRESULT, that distinction prevents duplicate dialogs, bindings, transfers, or roaming mutations.
Example for this HRESULT: A legacy proxy receives a REFER method it does not implement.
Protocol and object boundary
| RTC area | SIP final response boundary |
|---|---|
| Condition to prove | the server does not implement the SIP method needed |
| Objects to correlate | SIP request method, client transaction, response status, dialog identifiers and method-specific headers |
| Safe corrective direction | use a supported feature path or different capable endpoint rather than repeating the same method |
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, it 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.
Verification workflow
- Record it and
0x80EF01F5at the first RTC method or event that returns it. - Place it in its exact phase: parsing, discovery, transport, authentication, profile validation, dialog control, media, roaming, registration, redirection, or final response handling.
- Identify the client, profile, session, participant, presence object, terminal, or port manager that owns this it occurrence.
- prove the condition by ensuring the trace can capture method, Server/User-Agent identity, Allow and Supported headers, and target role.
- Apply one controlled change for this HRESULT: use a supported feature path or different capable endpoint rather than repeating the same method; then verify the result return value and resulting RTC state.
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.
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.
- Keep it intact through exception and UI layers; a generic parameter or network message is insufficient for diagnosis.
Do not confuse it with
For this HRESULT, 405 can occur even when the server implements that method elsewhere; for this HRESULT, the neighboring results below require different control-flow decisions.
RTC_E_STATUS_CLIENT_NOT_FOUND | the responding domain has no current user or resource matching the Request-URI |
|---|---|
RTC_E_STATUS_CLIENT_BAD_EXTENSION | the server requires removal of a SIP extension it does not understand |
RTC_E_STATUS_SERVER_BAD_GATEWAY | the responding gateway or proxy received an invalid response from an upstream server |
The comparison prevents it from being flattened into a subsystem-wide error bucket with unsafe generic remediation.
Verification after a fix
Verify the result fix with a minimal deterministic case that reaches “the server does not implement the SIP method needed”; the failing the case must assert the HRESULT and post-failure state; the passing case should alter one input and confirm both protocol outcome and cleanup.
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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