What does HRESULT 0x80EE0000 (RTC_E_SIP_CODECS_DO_NOT_MATCH) mean?

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

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.

• Code-specific proof for RTC_E_SIP_CODECS_DO_NOT_MATCH: compare payload types and rtpmap/fmtp values per m= section rather than comparing codec names globally.
• Identity and target for RTC_E_SIP_CODECS_DO_NOT_MATCH: message direction and transport.
• State at production for RTC_E_SIP_CODECS_DO_NOT_MATCH: start-line plus header names.
• Timing and ordering for RTC_E_SIP_CODECS_DO_NOT_MATCH: Content-Type and Content-Length.

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

• With RTC_E_SIP_CODECS_DO_NOT_MATCH, do not do not repair malformed signaling by silently deleting unknown headers or media sections.
• For RTC_E_SIP_CODECS_DO_NOT_MATCH, also do not do not log credentials or an unredacted SDP body from production calls.
• Do not translate RTC_E_SIP_CODECS_DO_NOT_MATCH into a broad “connection failed” label before preserving the RTC symbol and producing phase.

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.

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

• Microsoft RTC return constants — API or protocol rules used to interpret RTC_E_SIP_CODECS_DO_NOT_MATCH.
• SIP message and transaction rules — authoritative context for the RTC_E_SIP_CODECS_DO_NOT_MATCH boundary.
• SDP syntax — definitions relevant when reproducing RTC_E_SIP_CODECS_DO_NOT_MATCH.
• SDP offer/answer — API or protocol rules used to interpret RTC_E_SIP_CODECS_DO_NOT_MATCH.

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