ElevenLabs change history: SIP call failures

ElevenLabs reported a major SIP outage affecting calls to some numbers imported into the Agent Platform, starting 2026-07-31 00:45 UTC and lasting 18 h 15 min. The vendor cited infrastructure resource constraints as a likely contributor; remaining failures affected the US region. Mitigation returned failure rates to baseline, and the incident was resolved at 2026-07-31 19:00 UTC.