Self-hostable software: Communication - SIP

Scalable open source cross-platform telephony platform.

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

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

Troubleshooting and monitoring VoIP calls.

A lightweight sip proxy, location server, and registrar for a reliable and scalable SIP infrastructure.

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

Web interface for multi-platform voice switch called FreeSWITCH.

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.

VoIP Billing Solution for Freeswitch. It supports prepaid and postpaid billing with call rating and credit control. It also provides many other features.

Eqivo implements an API layer on top of FreeSWITCH facilitating integration between web applications and voice/video-enabled endpoints such as traditional phone lines (PSTN), VoIP phones, webRTC clients etc.

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

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