What does HRESULT 0x80EE000C (RTC_E_SIP_TIMEOUT) mean?

Status / error code:		Category:

Constant name:
Source:	Operating System:
Description: SIP Transaction timed out

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RTC_E_SDP_NO_MEDIA	RTC_E_SDP_FAILED_TO_BUILD

RTC_E_SIP_TIMEOUT

Operational meaning: `RTC_E_SIP_TIMEOUT`

Read this result as an RTC state-machine result: at this point in resolving a SIP destination and establishing UDP, TCP, TLS, or proxy transport before a transaction can proceed, the local RTC SIP transaction reached its timer limit without a qualifying final response.

Log this result as 0x80EE000C in the RTC interface facility 0xEE, not only as a signed decimal; for this HRESULT, the facility distinguishes local RTC validation from a response status mapped by the stack.

Before changing configuration for this HRESULT, capture method, transport, retransmit schedule, last provisional response, and whether any peer bytes arrived; the RTC codes surrounding this result are not equivalent because a local timeout is not the same as receiving SIP 408 from a server.

Signals worth preserving

Correlate this result at source: the method or callback, the owning object generation, and the active protocol transition; for this HRESULT, this keeps later retries from obscuring causality.

Code-specific proof for this HRESULT: capture method, transport, retransmit schedule, last provisional response, and whether any peer bytes arrived.
Correlation key for this HRESULT: DNS query type and answers.
Protocol or object snapshot for this HRESULT: local/remote socket tuple.
Last completed transition for this HRESULT: proxy tunnel response.
Expected output for this HRESULT: SIP transaction timer and retransmit count.

A useful it trace does not require communication content or secrets; in the result record, keep structural metadata and correlation identifiers while removing passwords, authorization material, complete numbers, and private presence data.

Recovery and control flow

The corrective direction for this HRESULT is to reconcile uncertain remote outcome, apply bounded backoff, and retry only when method semantics permit; for this HRESULT, cancellation, cleanup, and retry should remain with the component that owns the failed transition.

Before retrying it, 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 UDP INVITE is retransmitted until the client transaction times out with no response.

Protocol and object boundary

RTC area	`SIP` transport and reachability boundary
Condition to prove	the local RTC `SIP` transaction reached its timer limit without a qualifying final response
Objects to correlate	`SIP` URI, proxy/registrar address, DNS results, socket, `HTTP` CONNECT tunnel, transaction timer
Safe corrective direction	reconcile uncertain remote outcome, apply bounded backoff, and retry only when method semantics permit

The API and protocol context for this HRESULT is not optional: DNS discovery, socket establishment, proxy tunneling, and SIP transaction completion are distinct phases and should not be collapsed into one “network error”; the related it control-flow rule is that A retry is safe only after the application identifies whether any request bytes were transmitted and whether the previous client transaction still exists.

Verification workflow

Start from 0x80EE000C and it, then find the method/event pair that first exposed it.
the proof step is to capture method, transport, retransmit schedule, last provisional response, and whether any peer bytes arrived.
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 local timeout is not the same as receiving SIP 408 from a server.
after you reconcile uncertain remote outcome, apply bounded backoff, and retry only when method semantics permit, 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.

Actions that do not address this condition

With it, do not retry rapidly across every resolved address without preserving the failure phase.
Another non-solution for this HRESULT is to do not switch transports without checking profile policy and authentication constraints.
Keep it intact through exception and UI layers; a generic parameter or network message is insufficient for diagnosis.

Do not confuse it with

Use the following contrast when classifying it: it is tied to the condition “the local RTC SIP transaction reached its timer limit without a qualifying final response”; preserve that producing boundary before choosing recovery; for this HRESULT, similar subsystem names do not imply identical recovery.

`RTC_E_TOO_SMALL_EXPIRES_VALUE`	the server rejected or replaced an expiration interval because the requested value is below its minimum
`RTC_E_DESTINATION_ADDRESS_MULTICAST`	the signaling destination resolves to a multicast address unsupported for this RTC operation
`RTC_E_SIP_TRANSPORT_NOT_SUPPORTED`	the requested SIP transport is not implemented or allowed by the RTC profile/platform path

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

Verification after a fix

A regression test for this HRESULT should reproduce “the local RTC SIP transaction reached its timer limit without a qualifying final response” with the smallest profile, message, session, presence, media, or PINT fixture; for this HRESULT, assert 0x80EE000C, 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 — API or protocol rules used to interpret it.
SIP transport behavior — authoritative context for the boundary.
Locating SIP servers — definitions relevant when reproducing it.
SIP and TEL URLs in RTC — API or protocol rules used to interpret it.

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