---
page_type: error
code: 48029
message: >-
  48029: Outgoing conversation: Contact address type does not match proxy
  address type
level: ERROR
product: Frontline
---

## 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.