Voiance: How 9-1-1 Language Interpretation Should Be. Many PSAPs across the country, large and small, have selected Voiance, a leading provider of interpretation services to 9-1-1. Stop by to find out why they switched. Offering hundreds of languages and operating 24/7/365, our highly trained 9-1-1 interpreters are available in seconds. Calls to Voiance are serviced in secure, redundant, large-scale US interpreter contact centers, not off-shore.