update

Author: bryantanderson

fern/calls/call-ended-reason.mdx

@@ -30,8 +30,8 @@ Object](/api-reference/calls/get-call)).
 
 These relate to issues within the AI processing pipeline or the Large Language Models (LLMs) used for understanding and generating text:
 
-- **pipeline-error-\***: Various error codes indicate specific failures within the processing pipeline, such as function execution, LLM responses, or external service integration. Examples include OpenAI, Azure OpenAI, Together AI, and several other LLMs or voice providers.
-- **pipeline-error-first-message-failed:** The system failed to deliver the first message. This issue usually occurs when you add your own provider key in the voice section. It may be due to exceeding your subscription or quota limit.
+- **call.in-progress.error-vapifault-\***: Various error codes indicate specific failures within the processing pipeline, such as function execution, LLM responses, or external service integration. Examples include OpenAI, Azure OpenAI, Together AI, and several other LLMs or voice providers.
+- **pipeline-error-\***: Similar to **call.in-progress.error-vapifault-\***. However, these error codes are surfaced when you are using your own provider keys.
 - **pipeline-no-available-llm-model**: No suitable LLM was available to process the request.
 
 #### **Phone Calls and Connectivity**