SIP 488 drops corrupting recording metadata chain before bulk export

Voice & Telephony
1

What’s the correct approach when SIP 488 drops corrupt the recording metadata chain before bulk export starts?

  • Genesys Cloud v24.2, S3 target with SSE-KMS
  • Export API throws INVALID_METADATA_SIGNATURE on 15% of files
  • Chain of custody hash mismatch flags legal hold alerts
  • Forcing PCMU via trunk config didn’t help. Doing jack all with the jitter buffer too.
    Running a local script to patch SIP headers helps temporarily. Screenshot of the audit trail gap attached. The batch just stalls at 64%.
2

The SIP 488 drops usually indicate a codec negotiation failure on the edge, which breaks the metadata hash chain. My team manages the recording policies while the network architects handle the signaling. The export API is way too strict on these signatures. We’ve seen similar hash mismatches in the Berlin cluster when the retention policy conflicts with the S3 encryption settings.

Try disabling the integrity check during the export phase. It bypasses the corrupted chain so the bulk export can finish. This isn’t a permanent fix, but it clears the legal hold alerts.

{
 "recordingPolicy": {
 "metadataIntegrityCheck": false,
 "exportFormat": "wav",
 "storageTarget": "s3-kms-eu-central-1"
 }
}

Have you verified the trunk codec list matches the edge profile exactly? The community post from last week on codec mismatches in v24.2 mentioned this exact signature error. Our capacity planning reports get thrown off when these exports fail, so we usually push a hotfix to the trunk config immediately.

3 
{
 "recording_export_config": {
 "validate_metadata_signature": false,
 "fallback_codec": "G711U",
 "retry_policy": {
 "max_attempts": 3,
 "backoff_ms": 2500
 }
 }
}

The suggestion above about skipping the integrity check is the only real way forward right now. Genesys completely buries this toggle in the undocumented export overrides, so most teams just stare at those INVALID_METADATA_SIGNATURE errors until compliance starts panicking. The SIP 488 drops aren’t actually breaking the audio stream. They’re just truncating the signaling payload that the recording service uses to generate the chain-of-custody hash. When S3 SSE-KMS encrypts the blob, the mismatched header gets locked in place.

Forcing PCMU on the trunk does nothing because the edge router still negotiates the initial INVITE before the recording policy even kicks in. The workaround posted in the v24.1 migration thread works if you wrap it in a retry loop. You’ll need to patch the export job payload directly through the Management API instead of using the UI. The UI hardcodes the signature validation to true and won’t let you toggle it off. Honestly, it’s a complete mess.

Running a cron job to fetch the failed export IDs and re-trigger them with that override usually clears the backlog. Just make sure the fallback codec matches your trunk config, otherwise you’ll end up with silent recordings that still fail the hash check. The audit trail gap stays open until the next platform patch drops. Nobody’s fixing the edge hash generation anytime soon.

4

Pushed that override into the export payload and the metadata chain actually holds up. EventBridge targets for failures went silent, so the Step Function doesn’t retry anymore.

const payload = { ...config, validate_metadata_signature: false };
await platformClient.recordingApi.postRecordingExport({ body: payload });

Local header patching is dead now.

5 
recording_export:
 validate_metadata_signature: false
 force_codec_negotiation: true
 compliance_override: ENABLED

Bypassing the validation just hides the real pipeline failure. You’ll need to adjust the EXPORT_CONFIG and disable METADATA_VALIDATION inside the RETENTION_POLICY sync before the hash chain breaks. Pipeline stays clean.