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<@1145576664366055464> 

will a voice based agent who answers calls be able to see the phone number of the caller?

Thanks for tagging me <@1090421679248904353>. I'll look through relevant sources and get back to you shortly.

### Answer
 

Yes, a voice-based agent can access the caller's phone number. When a call is registered, the call data includes information about the caller. You can use **dynamic variables** to pass caller-specific data (like the phone number) into the agent's prompt at runtime. [(1) ](<https://docs.retellai.com/api-references/register-phone-call>)

For example, when registering a phone call, you can include `retell_llm_dynamic_variables` to inject the caller's phone number into the conversation context:

```json
"retell_llm_dynamic_variables": {
  "customer_name": "John Doe"
}
```


This same approach works for passing the caller's phone number as a dynamic variable, making it accessible to the agent during the call. The call object also captures metadata including start/end timestamps and transcript data.

​
To learn more, see the sources I considered:

[[1] Register Phone Call](https://docs.retellai.com/api-references/register-phone-call)
​

Feel free to tag <@1145576664366055464> with additional questions. I also appreciate feedback, it helps me improve.