In the past, I have used Asterisk as a SIP server on NetBSD and found it to be working fine.
I read Asterisk supports video calls as well. Has anyone tried it for video calls, particularly conference calls? Would one need `better' CPUs for that or most of the codec part is done on the clients? The requirement isn't large scale. Imagine something like 10-15 concurrent users on the same conference call. There aren't expected to be too many such calls running in parallel. Also which version of asterisk is advisable? I am on NetBSD-8 (still!). Mayuresh