---
"@context": https://schema.org
"@type": TechArticle
"@id": https://www.twilio.com/docs/api/errors/48029#article
headline: "48029: Outgoing conversation: Contact address type does not match proxy address type"
url: https://www.twilio.com/docs/api/errors/48029
inLanguage: en
dateModified: 2026-03-11T20:01:16.000Z
author:
  "@type": Organization
  name: Twilio Developer Education Team
publisher:
  "@type": Organization
  name: Twilio
---

# 48029: Outgoing conversation: Contact address type does not match proxy address type

Log Type: APPLICATION

Log Level: ERROR

## Description

A conversation could not be created because the provided Twilio proxy address does not match the contact's expected channel type.

### Possible causes

* The outgoing conversation callback returned a Twilio proxy number that does not match the channel type of the contact address.

### Possible solutions

* Make sure that the `proxy_address` value that is returned from the Outgoing Conversation callback has the same type as the channel over which the conversation is being created (i.e., for a WhatsApp conversation, use a Twilio proxy number with the prefix *whatsapp:*).
  * Check out the [docs](/docs/frontline/outgoing-conversations) on how to create outgoing conversations.