VoIP and Open Source, a Glimpse

Voip Planet write about VoIP being a fertile ground for Open Source Applications and goes on to describe what is current state of open source projects like Asterisk from Digium, (and of course other distributions based on Asterisk like TrixBox.) sipX from Pingtel that was started as a closed source project.
But the article misses other major open source efforts like SER and OpenSER.
VoIP: Fertile Ground for Open-Source Solutions

Tags: VoIP Development, Open Source VoIP, SER, OpenSER, Asterisk, sipX, Digium