When an agent has an active call and would like to call another agent in the BU, they have the option of Dialing the agent or Consulting the agent.  The main difference is that Consulting an agent does not show up on the call recordings.

When the recipient agent is in Available state, the only option will be Dialing the agent.

When the recipient agent is in an Unavailable state, by default, both Dialing and Consulting the agent are available.

Disabling Consult will remove the option of Consulting with the agent when they are in an unavailable state.