---
"@context": https://schema.org
"@type": TechArticle
"@id": https://www.twilio.com/docs/api/errors/16026#article
headline: "16026: Participant label is in use by another participant"
url: https://www.twilio.com/docs/api/errors/16026
inLanguage: en
dateModified: 2026-03-11T18:38:39.000Z
author:
  "@type": Organization
  name: Twilio Developer Education Team
publisher:
  "@type": Organization
  name: Twilio
---

# 16026: Participant label is in use by another participant

Log Type: APPLICATION

Log Level: ERROR

## Description

The participant label specified in an API call to create a voice conference participant is already in use by another active participant in the same conference.

### Possible causes

1. The specified label was already used in another API call to add a participant to the conference.
2. The specified label was already used in twiml (Dial Conference) to add an inbound participant to the conference

### Possible solutions

Use a label value which uniquely identifies this participant within the conference.