PII Redaction for Call Transcripts: Protect Customer Data with One Parameter

Call center transcripts are a goldmine for business intelligence - but they're also a minefield of personally identifiable information. Names, phone numbers, credit card details, social security numbers, and home addresses flow through every call. Storing or sharing unredacted transcripts is a compliance risk under GDPR, PCI-DSS, HIPAA, and CCPA.

VoxParse now supports automatic PII redaction with a single API parameter: redact_pii=true. No extra cost. No separate pipeline. Just add it to your existing transcription request.

How it works

When redact_pii=true is passed, VoxParse applies a post-processing step after AI analysis that replaces all detected PII with type-specific tokens:

Redaction applies to both the structured JSON fields (customer name, phone, email, etc.) and the full transcript_cleaned text. The call's business context - sentiment, call type, action items, compliance flags - is fully preserved.

Listen to the source call

This is the same call center recording from our transcription modes comparison. An inbound AT&T customer service call about a device exchange offer.

Side-by-side: Standard vs. PII-redacted

Both transcripts below use polished mode. The only difference is the redact_pii parameter.

Red-highlighted tokens show where PII was automatically replaced. All business context, call flow, and analytics are fully preserved.

Structured data is also redacted

PII redaction doesn't just affect the transcript text. The structured JSON fields in the AI analysis are also masked:

"customer": {
  "name": "Mr. Milgen",
  "phone": "406-539-1202",
  "address": "98 Maxton Drive"
},
"agent": {
  "name": "Erica"
},
"compliance": {
  "identity_verified": true,
  "sensitive_data_shared": [
    "phone number",
    "SSN (last 4)",
    "mailing address"
  ]
}

"customer": {
  "name": "[REDACTED_NAME]",
  "phone": "[REDACTED_PHONE]",
  "address": "[REDACTED_ADDRESS]"
},
"agent": {
  "name": "[REDACTED_NAME]"
},
"compliance": {
  "identity_verified": true,
  "sensitive_data_shared": [
    "phone number",
    "SSN (last 4)",
    "mailing address"
  ]
}

Notice that compliance.sensitive_data_shared still reports what types of PII were detected - it just doesn't include the actual values. This gives compliance teams visibility without exposure.

When to use PII redaction

• Sharing transcripts with third parties - Redact before sending to analytics vendors, consultants, or partners
• Long-term archival - Store redacted versions to reduce liability while keeping business intelligence
• Training and QA - Review agent performance without exposing customer data to coaching teams
• GDPR/CCPA compliance - Minimize PII in your data pipeline by default
• PCI-DSS environments - Never store card data in your transcript database

Pro tip: Call the API twice - once without redaction for your secure compliance archive, and once with redaction for everything else. Same audio, same price per call.

How to enable it

Add redact_pii=true to your existing transcription request. Works with both polished and verbatim modes.

# Standard transcription (PII visible)
curl -X POST https://api.voxparse.com/v1/transcribe \
  -H "X-API-Key: YOUR_API_KEY" \
  -F "[email protected]"

# With PII redaction
curl -X POST https://api.voxparse.com/v1/transcribe \
  -H "X-API-Key: YOUR_API_KEY" \
  -F "[email protected]" \
  -F "redact_pii=true"

# Verbatim mode + PII redaction
curl -X POST https://api.voxparse.com/v1/transcribe \
  -H "X-API-Key: YOUR_API_KEY" \
  -F "[email protected]" \
  -F "mode=verbatim" \
  -F "redact_pii=true"

Bottom line

Every transcription API can give you text from audio. Very few let you control what stays visible. With redact_pii=true, VoxParse gives you the full analytical power of AI-processed call transcripts while automatically stripping the data that creates compliance risk. One parameter. No extra cost. No separate workflow.

Read the full PII Redaction documentation for the complete token reference and integration guide.