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Degraded SIP Calls – Transfer to Human Affected

Resolved incidentMinor

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Incident updates

Every update ElevenLabs posted, oldest to newest, exactly as it appeared on their official status page.

  1. Investigating

    We are currently investigating an issue with SIP calls that is impacting the transfer-to-human flow. We are working on a fix.

  2. Monitoring

    We have pushed an update, and we are currently monitoring the situation.

  3. Resolved

    The root cause was an incompatibility in how ElevenLabs handled mid-dialog re-INVITEs. When SIP providers sent re-INVITEs, ElevenLabs responded with 488, which some providers treat as fatal, issue a BYE, and terminate the call. Per RFC 3261, a 488 should not necessarily result in session termination, but provider behaviour varied.

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