### Answer
The issue you're encountering, where the call ends immediately after the first message due to the assistant recognizing an "end call phrase," may be tied to specific configurations of your assistant or the phrases it is programmed to recognize. The "assistant-said-end-call-phrase" as an ended reason indicates that the assistant detected a phrase within its conversation or initial message that triggers it to end the call [(1)](
) .
If disabling the "endCallFunctionEnabled" option didn't resolve your issue, it's worth checking the configuration of your assistant's phrases and messages to ensure there are no unintended triggers. Additionally, review the "firstMessage" or any system prompts that might inadvertently contain phrases the assistant interprets as commands to end the call.
For detailed management and updating of assistants, including their configuration and the phrases they use, you might want to refer to the documentation on creating, updating, and managing assistants [(2)](
) [(3)](
) [(4)](
) .