> ## Documentation Index
> Fetch the complete documentation index at: https://docs.agentcallback.com/llms.txt
> Use this file to discover all available pages before exploring further.
# Campaigns
> Pair an agent with a contact list to place outbound calls at scale.
A campaign pairs an agent with a list of contacts and a calling configuration, so you can place outbound calls at scale instead of one at a time.
## Create a campaign
Choose the outbound agent the campaign should use.
Upload a file containing the people you want to call.
Map one column to the phone number to dial, and map any other columns to the agent's [variables](/build-voice-agents/variables) so each call has the right data.
## Calling configuration
A few settings control how the campaign places calls:
| Setting | Description |
| -------------------- | --------------------------------------------------------------------------------------------------- |
| Routing strategy | How outbound caller ID is chosen — `single` (one number), `geographic`, `random`, or `round_robin`. |
| Max concurrent calls | The most calls the campaign will have in progress at once. |
| Call spacing | How long, in seconds, to hold a concurrency slot after starting a call, before starting another. |
| Daily call limit | The most calls the campaign will place in a day. |
## Next steps
Control what happens when a call doesn't succeed.
Define a multi-day calling sequence per contact.
Control when the campaign starts and what hours it can call.