curl --request POST \
  --url https://app.autocalls.ai/api/user/assistant \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "assistant_name": "<string>",
  "voice_id": 123,
  "language": "<string>",
  "llm_model": "<string>",
  "calls_direction": "<string>",
  "engine_type": "<string>",
  "timezone": "<string>",
  "initial_message": "<string>",
  "system_prompt": "<string>",
  "phone_number_id": 123,
  "tool_ids": [
    123
  ],
  "endpoint_type": "<string>",
  "endpoint_sensitivity": 123,
  "interrupt_sensitivity": 123,
  "ambient_sound_volume": 123,
  "post_call_evaluation": true,
  "send_webhook_only_on_completed": true,
  "include_recording_in_webhook": true,
  "is_webhook_active": true,
  "webhook_url": "<string>",
  "use_min_interrupt_words": true,
  "min_interrupt_words": 123,
  "variables": {},
  "post_call_schema": [
    {
      "post_call_schema[].name": "<string>",
      "post_call_schema[].type": "<string>",
      "post_call_schema[].description": "<string>"
    }
  ],
  "end_call_tool.description": "<string>",
  "llm_temperature": 123,
  "voice_stability": 123,
  "voice_similarity": 123,
  "speech_speed": 123,
  "allow_interruptions": true,
  "filler_audios": true,
  "re_engagement_interval": 123,
  "max_call_duration": 123,
  "max_silence_duration": 123,
  "end_call_on_voicemail": true,
  "noise_cancellation": true,
  "record_call": true,
  "who_speaks_first": "<string>"
}
'