---
"@context": https://schema.org
"@type": TechArticle
"@id": https://www.twilio.com/docs/api/errors/50409#article
headline: "50409: Participant address equals proxy address"
url: https://www.twilio.com/docs/api/errors/50409
inLanguage: en
dateModified: 2026-03-11T20:43:38.000Z
author:
  "@type": Organization
  name: Twilio Developer Education Team
publisher:
  "@type": Organization
  name: Twilio
---

# 50409: Participant address equals proxy address

Log Level: ERROR

## Description

The supplied participant address must not equal its proxy address.

### Possible causes

* When requesting a participant to be added to a conversation, you specified the identical participant address and its proxy address parameters.

### Possible solutions

* Provide a participant's public address (e.g. user's SMS/MMS number) different from a conversation proxy number (e.g. Twilio SMS/MMS number) when adding a participant to the conference.