non-free.md: rename section IPBX -> Communication - SIP

2 years ago · a2626aae0d
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 - [Atman IoT](https://atman-iot.com) - Self hosted IoT gateway focused on IoT solution rapid prototyping, packaged as stand alone docker container, promising to help you build your IoT solution in a week. ([Demo](https://atman-iot.com/signup-redirect)) `⊘ Proprietary` `Nodejs`


-### IPBX
+### Communication - SIP

 - [Elastix](http://www.elastix.org) - Unified communications server software based on 3CX. `⊘ Proprietary` `Unknown`