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11 self-hosted alternatives to Asterisk (2026)

Easy to use but advanced IP PBX system, VoIP gateway and conference server.

License: GPL-2.0 · Language: C/deb source code

Flexisip source

Complete, modular and scalable SIP server, includes a push gateway, to deliver SIP incoming calls or text messages on mobile device platforms where push notifications are required to receive information when the app is not active in the foreground.

AGPL-3.0C/Docker

Freepbx source

Web-based open source GUI that controls and manages Asterisk.

GPL-2.0PHP

FreeSWITCH source

Scalable open source cross-platform telephony platform.

MPL-2.0C

FusionPBX source

Web interface for multi-platform voice switch called FreeSWITCH.

MPL-1.1PHP

Kamailio source

Modular SIP server (registrar/proxy/router/etc).

GPL-2.0C/deb

openSIPS source

SIP proxy/server for voice, video, IM, presence and any other SIP extensions.

GPL-2.0C

Routr source

Lightweight SIP proxy, location server, and registrar for a reliable and scalable SIP infrastructure.

MITDocker/K8S

SIP3 source

VoIP troubleshooting and monitoring platform.

Apache-2.0Java

Wazo source

Full-featured IPBX solution built atop Asterisk with integrated Web administration interface and REST-ful API.

GPL-3.0Python

Yeti-Switch source

Transit class4 softswitch(SBC) with integrated billing and routing engine and REST API.

GPL-2.0C++/Ruby

All 12 apps in communication-sip →