Description: CSipSimple is an open source SIP client for Android that allows you to make VoIP calls over Wi-Fi or mobile data. It supports common SIP features like call transfer, call forwarding, call waiting, 3-way conferencing, etc.
Type: software
Pricing: Open Source
Description: Maytapi is an open-source telephony platform that enables connecting software applications to phone systems. It provides APIs for building voice, SMS, and telephony solutions.
Type: software
Pricing: Open Source