VoIP and SMS Delivery Issues in Israel

What to do

• Check whether your product depends on Duo Security. Check your stack

  Paste a package.json, lockfile, Terraform or a list of domains at down.guide/stack to see every provider you depend on.

• Confirm your retries, queues and scheduled jobs caught up after the 4d 2h it lasted.

  Anything that failed between 2026-07-23 18:02 UTC and 2026-07-27 20:41 UTC may need a replay.

• Subscribe to Duo Security's feed to hear about the next one first. RSS feed

  https://down.guide/feed?provider=duo works in Slack (/feed subscribe), Discord feed bots and any RSS reader.

Updates from Duo Security 4

1. investigatingJul 23, 2026, 6:02 PM UTC

   We are investigating an issue affecting VoIP and SMS message delivery for users in Israel. The issue is related to an upstream carrier. Our team is working with our providers to investigate and restore normal service. Where available, users can use alternative authentication methods such as Duo Push. We will provide updates as more information becomes available.

   provider

2. monitoringJul 23, 2026, 6:39 PM UTC

   We have implemented a change to address the SMS and VoIP delivery issue affecting users in Israel. SMS and VoIP delivery have recovered, and we are monitoring to confirm continued stability.

   provider

3. monitoringJul 24, 2026, 3:53 PM UTC

   Error rates for SMS and VoIP delivery in Israel have reduced following the implemented change. We are continuing to monitor service behavior and investigate reports of intermittent failures affecting some customers. We will provide another update as more information becomes available.

   provider

4. resolvedJul 27, 2026, 8:41 PM UTC

   The SMS and VoIP delivery issue affecting users in Israel has been resolved. If customers continue to experience issues, please contact Duo Support.

   provider

Corrections

None so far.

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