The AI that answers the phone.
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FreeSWITCH is a Software Defined Telecom Stack enabling the digital transformation from proprietary telecom switches to a versatile software implementation that runs on any commodity hardware. From a Raspberry PI to a multi-core server, FreeSWITCH can unlock the telecommunications potential of any device.
Kamailio - The Open Source SIP Server for large VoIP and real-time communication platforms, focusing on flexibility, security and scalability
:iphone: [Android Library] Get device information in a super easy way.
Twilio C#/.NET Helper Library for .NET6+.
Self-hosted API-first AI call center: AI talks, code controls the call. AI agents answer every call; humans take over without dropping it. Runs on FreeSWITCH with your SIP trunk and realtime model (OpenAI, Grok, Qwen, Doubao, or any compatible gateway).
Modern and flexible SIP/VoIP cli tool
IVOZ Provider - Multitenant solution for VoIP telephony providers
P-KISS-SBC - simple and stupid SIP/RTP SBC - AGPL v3 - Based on kamailio / RTP Engine
The world's only Open Source CPaaS with a Twilio compatible API
:phone: SIP Parsing/Rendering Library for PHP
:scroll: Curated list of Realtime Internet Peering for Telephony (RIPT) resources
Telephony will be a xplat library that provides email, sms, voice and video call functionality. Supports Xamarin.iOS, Xamarin.Android, Windows Phone 8/8.1 (Silverlight and WPA)
:whale2: Minimal FreeSWITCH Docker images
Katari - Python Session Initiated Protocol Framework