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We've received an error from Retell when creating an agent with the `transfer_call` tool:

```
400 The number provided: +18716539494 is not a valid number. Please provide a valid number in e.164 format.
```

I believe the above number is in a correct e164 format. Please advise.

Hi <@1219330853788713100> 
The number +1871 appears to be in valid E.164 format syntactically, but Retell's validation likely considers it invalid because the 871 area code is not a real/active US area code.

What are you using custom or retell telephony