There are 3 repositories under voip-telephony-providers topic.
P-KISS-SBC - simple and stupid SIP/RTP SBC - AGPL v3 - Based on kamailio / RTP Engine
A FreeSWITCH specific scanning and exploitation toolkit for CVE-2021-37624 and CVE-2021-41157.
SIP servlets for Voice over IP and cloud telephony application and B2BUA / proxy SIP servers
Voip-scripts , for MangusBilling7
The Asterisk VOIP library, implemented in the Go programming language (Golang), is a versatile and powerful tool for building robust voice over IP (VOIP) communication systems.
Auto Complete - Country Codes and Network Descriptions
Make Outbound voice Calls via PHP on specified carriers or termination end points.
Python example of the TelecomsXChange Voice Communication Api