fonoster

Fonoster is an open-source communication platform that serves as a drop-in alternative to Twilio, enabling developers to build voice applications, manage SIP trunks, and handle programmable voice and messaging. It is designed for developers and businesses seeking to avoid vendor lock-in and reduce costs by self-hosting their telephony infrastructure. Its interest lies in offering a production-ready, extensible framework that combines the flexibility of open-source with the core features of a major cloud communications provider.