We recommend the use of Over-the-Phone Interpreting (OPI) when you need instant access to an interpreter (for less than 30 minutes). Support for OPI is available in dozens of languages. Access OPI. Learn more about OPI. On-Demand Interpreting (Dos and Don'ts) On-Demand Interpreting Troubleshooting Questionnaire On-Demand Interpreter's Evaluation Form List of Alternate Languages