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RTC_E_INVALID_SIP_URL
What the RTC value marks: RTC_E_INVALID_SIP_URL
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 supplied destination cannot be parsed or normalized as a SIP URI accepted by RTC.
Log this result as 0x80EE0012 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.
The first useful check for this HRESULT is to record a redacted URI, scheme, escaping, user/host split, port, and parameters; The result must be separated from nearby conditions because URI syntax failure occurs before DNS or server lookup.
A safe diagnostic sequence
- Record this result and
0x80EE0012at the first RTC method or event that returns it. - Identify the client, profile, session, participant, presence object, terminal, or port manager that owns this this result occurrence.
- Place it in its exact phase: parsing, discovery, transport, authentication, profile validation, dialog control, media, roaming, registration, redirection, or final response handling.
- prove the condition by ensuring the trace can record a redacted URI, scheme, escaping, user/host split, port, and parameters.
- Apply one controlled change for this HRESULT: construct the URI through one canonical parser and validate user input before session creation; then verify the result return value and resulting RTC state.
The result diagnosis is strongest when object state and protocol trace share timestamps and transaction identifiers; when diagnosing it, avoid treating packet capture and HRESULT logging as substitutes for one another.
Evidence that separates the cause
Do not wait for a generic failure notification to log it; 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: record a redacted URI, scheme, escaping, user/host split, port, and parameters.
- Identity and target for this HRESULT: local/remote socket tuple.
- State at production for this HRESULT: proxy tunnel response.
- Timing and ordering for this HRESULT:
SIPtransaction timer and retransmit count.
When recording it, 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.
Protocol and object boundary
| RTC area | SIP transport and reachability boundary |
|---|---|
| Objects to correlate | SIP URI, proxy/registrar address, DNS results, socket, HTTP CONNECT tunnel, transaction timer |
| Condition to prove | the supplied destination cannot be parsed or normalized as a SIP URI accepted by RTC |
| Safe corrective direction | construct the URI through one canonical parser and validate user input before session creation |
Two RTC rules frame it: first, DNS discovery, socket establishment, proxy tunneling, and SIP transaction completion are distinct phases and should not be collapsed into one “network error”; second, for this HRESULT, A retry is safe only after the application identifies whether any request bytes were transmitted and whether the previous client transaction still exists.
Related RTC results
It should not be grouped with every value from the same facility. It is tied to the condition “the supplied destination cannot be parsed or normalized as a SIP URI accepted by RTC”; preserve that producing boundary before choosing recovery; the result table shows nearby alternatives.
RTC_E_SIP_STACK_SHUTDOWN | an operation targeted an RTC SIP stack that has already entered shutdown |
|---|---|
RTC_E_DESTINATION_ADDRESS_MULTICAST | the signaling destination resolves to a multicast address unsupported for this RTC operation |
RTC_E_SIP_TLS_FAIL | the TLS transport failed outside the more specific tunnel, timeout, certificate, or compatibility cases |
The comparison prevents it from being flattened into a subsystem-wide error bucket with unsafe generic remediation.
How to handle the result
The owning RTC component should construct the URI through one canonical parser and validate user input before session creation; for this HRESULT, it should also settle or cancel its previous operation before callers begin a replacement.
Do not turn it into an immediate unconditional retry; for this HRESULT, first determine whether the peer could have accepted the prior request and whether RTC still owns a live transaction.
Example for this HRESULT: An application passes a display name and spaces where AddParticipant expects a SIP URI.
Actions that do not address this condition
- The following shortcut is unsafe for this HRESULT: do not switch transports without checking profile policy and authentication constraints.
- Do not retry rapidly across every resolved address without preserving the failure phase.
- Do not translate it into a broad “connection failed” label before preserving the RTC symbol and producing phase.
Verification after a fix
Verify the result fix with a minimal deterministic case that reaches “the supplied destination cannot be parsed or normalized as a SIP URI accepted by RTC”; 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 — definitions relevant when reproducing it.
- SIP transport behavior — API or protocol rules used to interpret it.
- Locating SIP servers — authoritative context for the boundary.
- SIP and TEL URLs in RTC — definitions relevant when reproducing it.
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