# Return Calls / Caller ID

Depending on your use case, you have three options for setting the caller ID phone number.

{% stepper %}
{% step %}

### [Shared Numbers with Call Forwarding](/drop-cowboy-docs/api/return-calls-caller-id/shared-numbers-with-call-forwarding.md)

Drop Cowboy maintains a shared pool of phone numbers available to all Drop Cowboy customers to use.
{% endstep %}

{% step %}

### [Private Number Pools](/drop-cowboy-docs/api/return-calls-caller-id/private-number-pools.md)

Drop Cowboy allows customers to maintain pools of phone numbers that are private to their Drop Cowboy account and not shared with other Drop Cowboy customers.
{% endstep %}

{% step %}

### [Explicit Caller ID (Requires Bring Your Own Carrier)](/drop-cowboy-docs/api/return-calls-caller-id/explicit-caller-id-requires-bring-your-own-carrier.md)

Drop Cowboy customers using their own SIP trunks with our Bring Your Own Carrier solution are able to explicitly set the `caller_id` property of the RVM API request.
{% endstep %}
{% endstepper %}


---

# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://drop-cowboy.gitbook.io/drop-cowboy-docs/api/return-calls-caller-id.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.