Self-hosted alternatives to Twilio

FreeSWITCH

★ 4,950

Scalable open source cross-platform telephony platform.

Asterisk

★ 3,316

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

Kamailio

★ 2,855

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

SIPCAPTURE Homer

★ 1,975

Troubleshooting and monitoring VoIP calls.

Routr

★ 1,688

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

openSIPS

★ 1,482

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

FusionPBX

★ 1,014

Web interface for multi-platform voice switch called FreeSWITCH.

Flexisip

★ 185

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.

3CX

Full-featured PABX system, with call queues, built-in web conferencing, live chat and social media messaging all on one system.

Freepbx

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

SIP3

VoIP troubleshooting and monitoring platform.

Wazo

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