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				|  | @ -397,6 +397,7 @@ _[SIP](https://en.wikipedia.org/wiki/Session_Initiation_Protocol) telephony soft | |||
| - [Kamailio](http://www.kamailio.org/w/) - Modular SIP server (registrar/proxy/router/etc). ([Source Code](https://github.com/kamailio/kamailio)) `GPL-2.0` `C` | ||||
| - [Ostel](https://dev.guardianproject.info/projects/ostel/wiki/Server_Documentation) - Secure SIP telephony setup with ZRTP encryption. `GPL-3.0` `Ruby` | ||||
| - [Tapir](http://www.sip3.io/) - Troubleshooting and real-time monitoring of VoIP-based systems. ([Source Code](https://github.com/sip3io/tapir)) `Apache-2.0` `Java/Kotlin` | ||||
| - [ASTPP](https://www.astppbilling.org/) - is an Open Source VoIP Billing Solution for Freeswitch. It supports prepaid and postpaid billing with call rating and credit control. It also provides many other features. ([Source Code](https://github.com/iNextrix/ASTPP)) `AGPL-3.0` | ||||
| 
 | ||||
| ### IPBX | ||||
| 
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|  |  | |||
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