I was making 3 dials at once in Outreach and after I finished my session, half of the tasks remained
Not applicable - Salesforce is not based on call tasks. We will log activity to SFDC for every call placed other than cancelled calls.
Outreach and Salesloft
Orum will complete tasks that result in a fully completed call that either went to a VM or No Answer. Orum will not complete call tasks when encountering Dial-Tree, Failed, Busy, or upon cancelling a call.