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<@1145576664366055464> What is the custom field to determine is a user has hungup on the AI?

Thanks for tagging me <@834251599454928926>. I'll look through relevant sources and get back to you shortly.

### Answer
 To determine if a user has hung up on the AI, you should check the `disconnection_reason` field in the call object. [(1) ](<https://docs.retellai.com/api-references/register-phone-call>)

When a user hangs up, the `disconnection_reason` will be set to `user_hangup`. 

The available options for `disconnection_reason` include: 
- `user_hangup` - The user ended the call
- `agent_hangup` - The agent ended the call
- `call_transfer` - Call was transferred
- `voicemail_reached` - Voicemail was reached
- `inactivity` - Call ended due to inactivity
- `max_duration_reached` - Maximum call duration was reached
- And several other options for various error conditions

You can access this field from the call object after the call ends, or subscribe to webhooks like `call_ended` to receive this information.

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To learn more, see the sources I considered:

[[1] Register Phone Call](https://docs.retellai.com/api-references/register-phone-call)
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Feel free to tag <@1145576664366055464> with additional questions. I also appreciate feedback, it helps me improve.