Outage in Zipwhip
SMS Delivery Receipt Delays from Twilio to Chunghwa Telecom Taiwan
Resolved MinorIncident Report
Summary AI Generated
Zipwhip experienced a 3.4-hour incident where SMS delivery receipt delays affected messages sent from Twilio to Chunghwa Telecom subscribers in Taiwan. While messages themselves were likely delivered successfully, delivery receipts were delayed due to an identified issue between the two networks. The team resolved the root cause and confirmed recovery after observing restored delivery receipt flow.
Twilio customers may be experiencing SMS delivery delays from Twilio to Chunghwa Telecom network subscribers in Taiwan. Our team is actively investigating this issue. We will provide another update in 1 hour or as soon as more information becomes available.
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Latest Updates ( sorted recent to last )
MONITORING
about 3 hours ago - at 09/16/2026 08:22PM
We have observed a recovery in SMS delivery receipts from Twilio to Chunghwa Telecom network subscribers in Taiwan and are monitoring service stability. We will provide another update in 2 hours or as soon as more information becomes available.
IDENTIFIED
about 4 hours ago - at 09/16/2026 07:20PM
Twilio customers may be experiencing SMS delivery receipt delays from Twilio to Chunghwa Telecom network subscribers in Taiwan. Our team has identified the cause, and is working to resolve the issue. Message delivery may succeed, but delivery receipts may be delayed. We will provide another update in 1 hour or as soon as more information becomes available.
INVESTIGATING
about 4 hours ago - at 09/16/2026 07:10PM
Twilio customers may be experiencing SMS delivery receipt delays from Twilio to Chunghwa Telecom network subscribers in Taiwan. Our team is actively investigating this issue. Message delivery may succeed, but delivery receipts may be delayed. We will provide another update in 2 hours or as soon as more information becomes available.
INVESTIGATING
about 4 hours ago - at 09/16/2026 06:57PM
Twilio customers may be experiencing SMS delivery delays from Twilio to Chunghwa Telecom network subscribers in Taiwan. Our team is actively investigating this issue. We will provide another update in 1 hour or as soon as more information becomes available.
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