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RTC_E_STATUS_SESSION_PROGRESS
RTC signaling reports session progress
RTC_E_STATUS_SESSION_PROGRESS is HRESULT 15663287 (0x00EF00B7) from RTC Core. AllStat describes it as “Session Progress.” In the legacy RTC Client API and SIP-style provisional call signaling, the value reports a nonfailure state that must not be collapsed into plain S_OK.
Wrappers should not translate this result to an undifferentiated Boolean before state handling finishes.
Where the status is encountered
- RTC call setup and provisional signaling; capture the exact API, object, and phase because the same numeric success severity does not define the state by itself.
- Roaming capability negotiation;
- Softphone, conferencing, gateway, or proxy call-state UI;
Keep it attached to the operation that returned it. Interpreting it outside that API contract can turn a normal continuation or partial result into an incorrect retry or false completion.
What must be true before accepting it
Verify that the response may establish early media or other progress before final call acceptance and media handling follows negotiated parameters. Validation of it keeps a success-severity result from becoming a broader promise than the API made.
Also confirm that returned outputs belong to the current operation generation and were not inherited from an earlier attempt.
Correct handling and recovery
Process any session description, open early media only when policy allows, and keep the call provisional until a final response.
A new attempt following it should be triggered by a meaningful transition, not merely by elapsed time.
Difference from nearby results
Ringing communicates alerting; Session Progress can carry media or progress without asserting ringing.
The distinction around it should be visible in control flow, telemetry classification, and user messaging.
Practical scenario
A gateway sends Session Progress with an SDP answer and an announcement. The client plays early media while still allowing cancel.
References
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