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What does HRESULT 0x80EE0000 (RTC_E_SIP_CODECS_DO_NOT_MATCH) mean?

 
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RTC_E_SIP_CODECS_DO_NOT_MATCH

What the RTC value marks: RTC_E_SIP_CODECS_DO_NOT_MATCH

RTC_E_SIP_CODECS_DO_NOT_MATCH is useful only when preserved with its producing phase; in parsing, constructing, or reconciling SIP signaling and the SDP offer/answer carried by it, RTC_E_SIP_CODECS_DO_NOT_MATCH denotes the local offer and remote answer have no common codec for an active media line.

The machine-readable identity of RTC_E_SIP_CODECS_DO_NOT_MATCH is 0x80EE0000 in the RTC interface facility 0xEE; the RTC_E_SIP_CODECS_DO_NOT_MATCH identity matters because RTC uses separate facilities for API conditions, SIP final responses, and PINT service statuses.

The first useful check for RTC_E_SIP_CODECS_DO_NOT_MATCH is to compare payload types and rtpmap/fmtp values per m= section rather than comparing codec names globally; the RTC_E_SIP_CODECS_DO_NOT_MATCH result must be separated from nearby conditions because a codec mismatch is media negotiation failure; it does not mean SIP transport or the audio device failed.

Protocol and object boundary

RTC areaSIP message and SDP negotiation boundary
Objects to correlateSIP start-line and headers, message body framing, SDP session and media sections, offer/answer generation
Condition to provethe local offer and remote answer have no common codec for an active media line
Safe corrective directionoffer at least one mutually supported codec with compatible parameters or select a media mode both endpoints implement

The API and protocol context for RTC_E_SIP_CODECS_DO_NOT_MATCH is not optional: SIP transaction state and media negotiation are separate: a syntactically valid SIP request can still contain absent or unacceptable SDP; the related RTC_E_SIP_CODECS_DO_NOT_MATCH control-flow rule is that An SDP update must be checked against the previous offer/answer state, not merely parsed as a standalone text document.

Evidence that separates the cause

For RTC_E_SIP_CODECS_DO_NOT_MATCH, the earliest callback or return site is the most valuable; later RTC_E_SIP_CODECS_DO_NOT_MATCH cleanup can replace the original state, so correlate the code with the object generation that produced it.

For privacy-safe analysis of RTC_E_SIP_CODECS_DO_NOT_MATCH, preserve protocol structure rather than payload content; for RTC_E_SIP_CODECS_DO_NOT_MATCH, authentication values, complete addresses, buddy lists, and bodies should be redacted or hashed under policy.

A safe diagnostic sequence

  1. Record RTC_E_SIP_CODECS_DO_NOT_MATCH and 0x80EE0000 at the first RTC method or event that returns it.
  2. Place RTC_E_SIP_CODECS_DO_NOT_MATCH in its exact phase: parsing, discovery, transport, authentication, profile validation, dialog control, media, roaming, registration, redirection, or final response handling.
  3. Identify the client, profile, session, participant, presence object, terminal, or port manager that owns this RTC_E_SIP_CODECS_DO_NOT_MATCH occurrence.
  4. For RTC_E_SIP_CODECS_DO_NOT_MATCH, prove the condition by ensuring the trace can compare payload types and rtpmap/fmtp values per m= section rather than comparing codec names globally.
  5. Apply one controlled change for RTC_E_SIP_CODECS_DO_NOT_MATCH: offer at least one mutually supported codec with compatible parameters or select a media mode both endpoints implement; then verify the RTC_E_SIP_CODECS_DO_NOT_MATCH return value and resulting RTC state.

For RTC_E_SIP_CODECS_DO_NOT_MATCH, a SIP capture without RTC callback state cannot show which local object accepted or rejected the transition; for RTC_E_SIP_CODECS_DO_NOT_MATCH, an HRESULT-only log has the opposite weakness: it cannot show whether the result was generated before transmission or mapped from the peer.

How to handle the result

The corrective direction for RTC_E_SIP_CODECS_DO_NOT_MATCH is to offer at least one mutually supported codec with compatible parameters or select a media mode both endpoints implement; for RTC_E_SIP_CODECS_DO_NOT_MATCH, cancellation, cleanup, and retry should remain with the component that owns the failed transition.

For RTC_E_SIP_CODECS_DO_NOT_MATCH, distinguish local rejection from an operation that may already have reached the server; for RTC_E_SIP_CODECS_DO_NOT_MATCH, use transaction identifiers and final events before replaying any non-idempotent action.

Example for RTC_E_SIP_CODECS_DO_NOT_MATCH: One endpoint offers only a proprietary audio codec while the peer accepts only PCMU; signaling succeeds but the media offer cannot be completed.

Actions that do not address this condition

Related RTC results

The practical separator for RTC_E_SIP_CODECS_DO_NOT_MATCH is this: this result is tied to the condition “the local offer and remote answer have no common codec for an active media line”; preserve that producing boundary before choosing recovery; for RTC_E_SIP_CODECS_DO_NOT_MATCH, compare that boundary with these related RTC values.

RTC_E_SDP_NO_MEDIAthe SDP contains no enabled media description usable for the requested RTC session
RTC_E_SIP_HEADER_NOT_PRESENTan RTC operation requires a SIP header that is absent from the parsed message
RTC_E_SIP_UDP_SIZE_EXCEEDEDthe serialized SIP datagram exceeds the size accepted by the RTC UDP transport path

For RTC_E_SIP_CODECS_DO_NOT_MATCH, facility equality is not semantic equality; route each contrasted value through its own recovery branch.

Verification after a fix

Verify the RTC_E_SIP_CODECS_DO_NOT_MATCH fix with a minimal deterministic case that reaches “the local offer and remote answer have no common codec for an active media line”; the failing RTC_E_SIP_CODECS_DO_NOT_MATCH 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

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