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toolani - Cheap international calls
Asterisk - An open source telephony switching and private branch exchange service for Linux.
KeepCalling - Best Rates for International Calls. No Contract, Expiry, or PIN. Use Any Phone, Smartphone or PC.
FreeSWITCH - FreeSWITCH is an open-source media application designed to support popular protools such as SIP and WebRTC and provides a platform to develop voice and video applications.
Rebel Calling - Internet-free international calling for $1 a month
Wazo.io - The UCaaS Platform Built for MSPs