Open Secure Telephony Network
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= 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.
URL = https://ostel.me/
Example
Ostel.me Android app is based upon the open-source CSipSimple app, which utilizes the pjsip and ZRTP4PJ libraries to provide transport and media encryption and verification.