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INCIDENT RESOLVED

Twilio

✓

Inbound SIP Calls With OPUS Codec Only Blocked

Updated

Resolved 13:10Started 2Timeline events

Confirmed by the official source.

Executive summary

  • Summary

    Twilio identified an issue in which some calls using Programmable Voice SIP interfaces and the OPUS codec may be unexpectedly rejected with SIP 488 responses. The incident was reported as being monitored while engineering worked on a fix.

What users experienced

  • User impact

    Some inbound SIP calls using the OPUS codec may be rejected with SIP 488 responses.

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Started

13:1015 Sep 2026
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Timeline events

2View timeline →

Timeline of the incident

  1. Detection

    Confirmed by an official service source.

  2. Resolution

    The service is no longer reporting this incident as active.

What we know

  • ✓Twilio officially identified an issue affecting some calls using Programmable Voice SIP interfaces and the OPUS codec.
  • ✓Affected requests may receive SIP 488 responses.
  • ✓Twilio reported the incident status as monitoring and said engineering was working on a fix.