### Answer No,

{{user_number}}

is not the same for both from and to numbers. [(1) ]() The

{{user_number}}

dynamic variable represents the user's phone number, which changes based on call direction: - For **inbound calls**:

{{user_number}}

is the from_number - For **outbound calls**:

{{user_number}}

is the to_number There's also a separate

{{agent_number}}

variable that represents: - For **inbound calls**: the to_number - For **outbound calls**: the from_number So

{{user_number}}

always refers to the end user's phone number, while

{{agent_number}}

always refers to the agent's phone number, regardless of call direction.

​ To learn more, see the sources I considered: [[1] Dynamic Variables](https://docs.retellai.com/build/dynamic-variables) ​

Feel free to tag @AI Evy with additional questions. I also appreciate feedback, it helps me improve.

### Answer For batch calls, the CSV format requires a header row that includes a "phone number" column. [(1) ]() You can download a template by clicking "Download the template" in the Retell AI workspace when creating a batch call. Optional columns you can include: - `override agent id`: Override the agent used for this particular call - `override agent version`: Override the agent version for this particular call - `metadata`: A JSON string to store arbitrary data with the call (e.g.,

{"customer_id":"cust_123"}

) - `custom_sip_headers`: A JSON string of custom SIP headers, keys must start with

X-

(e.g.,

{"X-Custom-Header":"value"}

) - `ignore e164 validation`: Set to

true

to bypass e.164 format validation (only applies when using custom telephony, not Retell Telephony) For dynamic variables: Add additional columns in the CSV with custom data for each recipient. For example, a column header

first_name

can be referenced as

{{first_name}}

in your prompts. Any columns not listed above are treated as dynamic variables that get injected into your Response Engine prompt and tool descriptions.

​ To learn more, see the sources I considered: [[1] Create Batch calls](https://docs.retellai.com/deploy/make-batch-call) ​

Feel free to tag @AI Evy with additional questions. I also appreciate feedback, it helps me improve.

@AI Evy can you give me a list of basic variables we would use for outbound for just name an dphone number

### Answer For a basic outbound call CSV with just name and phone number, you would use: [(1) ]() Required column: -

phone number

- The phone number to call Custom dynamic variable columns: -

customer_name

or

name

- The recipient's name Example CSV format:

phone number,customer_name
+12137774445,John Doe
+14157774444,Jane Smith

You can then reference these variables in your agent prompts using the

{{variable_name}}

syntax, like

{{customer_name}}

When making outbound calls via API, you would pass these in the

retell_llm_dynamic_variables

field: [(2) ]()

{
  "customer_name": "John Doe"
}

All values in

retell_llm_dynamic_variables

must be strings

​ To learn more, see the sources I considered: [[1] Dynamic Variables](https://docs.retellai.com/build/dynamic-variables) [[2] Outbound Calls (Make Calls)](https://docs.retellai.com/deploy/outbound-call) ​

Feel free to tag @AI Evy with additional questions. I also appreciate feedback, it helps me improve.

### Answer To use the name from your CSV in the agent's prompt, reference it using the

{{variable_name}}

syntax. [(1) ]() For example, if your CSV column is named

customer_name

, you would add this to your prompt:

Hello {{customer_name}}, thanks for calling!

Or if you named the column `name`:

Hi {{name}}, how can I help you today?

The variable name in your prompt must match the column header in your CSV exactly. When the agent makes the call,

{{customer_name}}

will automatically be replaced with the actual name from that row in the CSV. You can use dynamic variables in: - **Prompts**: Agent instructions and personality - **Begin message**: Opening greeting - **Tool configurations**: Custom function URLs, tool descriptions, property descriptions

​ To learn more, see the sources I considered: [[1] Dynamic Variables](https://docs.retellai.com/build/dynamic-variables) ​

Feel free to tag @AI Evy with additional questions. I also appreciate feedback, it helps me improve.