AS you already know, this year we are running again an OpenSIPS training
@ ClueCon 2017 - about how to do front-ending and clustering for
FreeSWITCH system, including some of the latest cool features available
in OpenSIPS 2.3, like mid-registration for registration throttling and
aggregation, FreeSWITCH driven load balancing and more. This year will
also show how to use the OpenSIPS front-end to add more services (like
presence and BLF) to your system, independently to FreeSWITCH. See full
description here https://goo.gl/7NtYVF .