A service level of 80 and a service level target of 20 for voice interactions mean that 80% of calls must be answered within 20 seconds. Service level is a metric that measures how well a contact center meets its customer service goals. Service level is calculated by dividing the number of interactions answered within a specified time threshold (service level target) by the total number of interactions offered in a given period. For example, if a contact center receives 100 calls in an hour and answers 80 calls within 20 seconds, then its service level is 80/100 = 0.8 or 80%. Reference: https://help.mypurecloud.com/glossary/service-level/ https://help.mypurecloud.com/articles/queue-performance-summary-report/