Update README.md

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surensarukhanyan 2017-04-27 12:50:44 +01:00 committed by GitHub
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@ -333,6 +333,7 @@ _[SIP](https://en.wikipedia.org/wiki/Session_Initiation_Protocol) telephony soft
* [FreeSWITCH](https://freeswitch.org/) - Scalable open source cross-platform telephony platform. ([Source Code](https://freeswitch.org/stash/projects/FS/repos/freeswitch/browse)) `MPLv2` `C`
* [Kamailio](http://www.kamailio.org/w/) - Modular SIP server (registrar/proxy/router/etc). ([Source Code](https://github.com/kamailio/kamailio)) `GPLv2` `C`
* [Ostel](https://dev.guardianproject.info/projects/ostel/wiki/Server_Documentation) - Secure SIP telephony setup with ZRTP encryption. `GPLv3` `Ruby`
* [Unified Ring](https://www.unifiedring.co.uk/) - Unifies your business communication with Hosted PBX, SIP Trunking and Bulk SMS. `GPLv2` `C`
### IPBX