OSTel - The Ostel.me Android app is based upon the open-source CSipSimple application, which utilizes the pjsip and Zorg libraries to provide transport and media encryption and verification.
This service is a public testbed of the Open Secure Telephony Network (OSTN) project, with the goal of promoting the use of free, open protocols, standards and software, to power end-to-end secure voice communications on mobile devices, as well as with desktop computers. Other OSTN instances include Tanstagi and Intimi.ca.
Visit Ostel.me to learn more about the Open Secure Telephony project and to sign up to become a test user.
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