Every campaign lives within a dial group, which means you must set up and configure a dial group before you create your first campaign.
A dial group is a pool of campaigns an agent can log into and dial from. Each dial group will only dial via one particular dialing mode at a time.
If you do create multiple dial groups (this is recommended if you wish to use different dialing modes for different campaigns), agents can only ever be actively logged into one dial group (and thus only using one outbound dialer) at a time.
You’ll notice that when you
configure your agent login screens, you can give agents the option to make multiple concurrent choices from a list of inbound queues. For outbound dialing, however, agents will only be able to choose one dial group to dial from at any given time. Once the agent selects a dial group, they will have dialing access to all of the campaigns within that dial group.