Digium/Asterisk
Open-source VoIP has started to take hold, and it's no wonder the pioneer of the open-source VoIP revolution, Asterisk, is being seen as a viable alternative. Digium delivers the hardware and software based on Asterisk code to make an open-source VoIP deployment a reality. Aimed mostly at SMBs, Digium and Asterisk have become the most widely used open-source telephony platform.
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