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Telnyx SIP 488 Not Acceptable Here

The session description is not acceptable.

Understanding Telnyx Voice/Calls Communication API

Telnyx is a leading provider of Voice/Calls Communication APIs, offering robust solutions for integrating voice capabilities into applications. These APIs enable developers to build applications that can make and receive calls, manage call flows, and integrate with other communication services seamlessly. Telnyx is known for its reliability, scalability, and flexibility, making it a popular choice for engineers looking to enhance their communication infrastructure.

Identifying the Symptom: SIP 488 Not Acceptable Here

One common issue encountered when using Telnyx's Voice/Calls API is the SIP 488 error, which is displayed as "Not Acceptable Here." This error typically arises during call setup and indicates that the session description provided is not acceptable to the recipient. This can manifest as failed call attempts or dropped calls, disrupting communication services.

Exploring the Issue: What is SIP 488?

Understanding SIP 488 Error Code

The SIP 488 error code is part of the Session Initiation Protocol (SIP) response codes, which are used to indicate the status of a SIP request. The "Not Acceptable Here" response suggests that the session description protocol (SDP) offer does not match the recipient's capabilities or preferences. This can occur due to codec mismatches, unsupported media types, or incompatible session parameters.

Common Causes of SIP 488

Some common causes of the SIP 488 error include:

  • Codec incompatibility between the caller and recipient.
  • Unsupported media types or formats in the SDP offer.
  • Incorrect or missing session parameters in the SDP.

Steps to Resolve SIP 488 Error

Step 1: Verify Codec Compatibility

Ensure that the codecs specified in the SDP offer are supported by both the caller and recipient. You can check the list of supported codecs in the Telnyx documentation. Update your application's configuration to include only compatible codecs.

Step 2: Review SDP Offer

Examine the SDP offer being sent during the call setup. Ensure that all media types and formats are supported by the recipient. You can use tools like Wireshark to capture and analyze SIP packets for detailed inspection.

Step 3: Adjust Session Parameters

Check the session parameters in the SDP offer, such as bandwidth, encryption, and media attributes. Ensure they align with the recipient's capabilities. Refer to the SDP RFC 4566 for guidance on correct SDP formatting.

Step 4: Test and Validate

After making the necessary adjustments, test the call setup process to ensure the issue is resolved. Use Telnyx's portal for monitoring call logs and troubleshooting any further issues.

Conclusion

By understanding the SIP 488 error and following these steps, engineers can effectively troubleshoot and resolve issues related to incompatible session descriptions in Telnyx's Voice/Calls Communication API. Ensuring codec compatibility, reviewing SDP offers, and adjusting session parameters are key actions to prevent this error and maintain seamless communication services.

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