Somleng is an Open Source Cloud Communications Platform as a Service (CPaaS). It contains an open source implementation of Twilio's REST API, as well as functionality for carrier services.
If you want to get the full Somleng stack up and running on your local machine, please follow the GETTING STARTED guide to get started.
https://www.somleng.org/docs/twilio_api
The software is available as open source under the terms of the MIT License.