One area where freeswitch is probably used quite often (and without support contract) are BigBlueButton installations (virtual classroom system) in schools and universities. I am more worried about them then about telcos.

It would be nice to see an implementation of TCP fusion (on Solaris) or SIO_LOOPBACK_FASTPATH (on Windows) for Linux.

Someone on HN giving kudos to Windows for once. Has hell frozen over.

Came here to say the same. I'm glad linux is finally catching up to Solaris.