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RTC_E_STATUS_INFO_TRYING
RTC signaling reports Trying
RTC_E_STATUS_INFO_TRYING is HRESULT 15663204 (0x00EF0064) from RTC Core. AllStat describes it as “Trying.” 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.
The application should branch on this result before a generic success path consumes the details.
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 this result 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 transaction remains active and provisional responses are correlated to the correct request. That proof prevents usable partial state from being confused with full completion.
Also confirm that returned outputs belong to the current operation generation and were not inherited from an earlier attempt.
Correct handling and recovery
Keep call setup pending, refresh timers according to the RTC stack, and avoid presenting ringing before a later response confirms it.
Do not use an unchanged tight retry loop for this HRESULT; it can duplicate effects or conceal a terminal state.
Difference from nearby results
Ringing indicates alerting at the destination; Trying only confirms that processing has begun.
The neighboring result changes whether output is final, more work remains, or fallback is required.
Practical scenario
An outbound call receives Trying from a proxy. The UI remains in Connecting until a subsequent Ringing or final response.
References
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