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Telnyx SIP 415 Unsupported Media Type

The media type in the request is not supported.

Understanding Telnyx and Its Purpose

Telnyx is a leading provider of Voice/Calls Communication APIs, enabling developers to integrate voice, messaging, and other communication functionalities into their applications. It offers a robust platform for building scalable and reliable communication solutions, catering to a wide range of industries and use cases.

Identifying the Symptom: SIP 415 Unsupported Media Type

When working with Telnyx's Voice API, you might encounter the error 'SIP 415 Unsupported Media Type'. This error typically manifests when a call attempt fails, and the system logs indicate that the media type specified in the SIP request is not supported.

What You Observe

During call setup, the call fails to connect, and the error message 'SIP 415 Unsupported Media Type' is returned. This indicates a mismatch in the media types expected by the communicating parties.

Explaining the Issue: SIP 415 Error Code

The SIP 415 error code is part of the SIP protocol's response codes, indicating that the media type in the request is not supported by the server or the recipient. This often occurs when there is a discrepancy between the codecs or media formats supported by the sender and receiver.

Common Causes

  • Mismatch in supported codecs between the client and server.
  • Incorrect media type specified in the SIP INVITE request.
  • Configuration issues in the SIP client or server settings.

Steps to Resolve the SIP 415 Error

To address the SIP 415 Unsupported Media Type error, follow these actionable steps:

1. Verify Supported Codecs

Ensure that both the client and server support the same set of codecs. You can check the supported codecs in your SIP client configuration and compare them with the server's capabilities. Common codecs include G.711, G.729, and Opus.

2. Adjust SIP Client Settings

Modify the SIP client settings to match the server's supported media types. This may involve changing the codec preferences or updating the media type in the SIP INVITE request. Refer to your SIP client's documentation for specific instructions.

3. Update Server Configuration

If the issue persists, review the server configuration to ensure it is set to accept the media types specified by the client. This may require updating the server's codec list or adjusting its media handling settings.

4. Test the Configuration

After making the necessary adjustments, test the call setup to verify that the issue is resolved. If the error persists, consider consulting Telnyx's support documentation or reaching out to their support team for further assistance.

Conclusion

By ensuring compatibility between the media types supported by both the client and server, you can effectively resolve the SIP 415 Unsupported Media Type error. Regularly reviewing and updating your communication settings will help maintain seamless connectivity and enhance the performance of your Telnyx-powered applications.

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