You just told me to set callerId to {{original_caller_number}} at runtime. What is the exact runtime variable name I should use in VAPI for the original caller's number? Is it {{call.customer.number}} or {{customer.number}} or something else? Please confirm the exact variable that will be populated at runtime during a live call.

The exact runtime variable you should use for the original caller's number in VAPI is:

{{customer.number}}

Use this variable in your configuration or JSON payloads—VAPI will automatically populate it with the caller's phone number during a live call. Example:

json
{
  "callerId": "{{customer.number}}"
}

Source: - [VAPI Dynamic Variables Documentation](https://docs.vapi.ai/assistants/dynamic-variables)

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