Debian 10 "Buster" is the reference platform for FreeSWITCH™ as of version 1.10
Dependencies are available from FreeSWITCH repository via the "apt-get build-dep freeswitch" command.
Sofia-sip and SpanDSP Notice!
Sofia-sip and SpanDSP dependencies have been removed from the FreeSWITCH™ tree since v1.10.4 Release (05 August 2020).
You can find source files of Sofia-sip here: https://github.com/freeswitch/sofia-sip
SpanDSP sources are here: https://github.com/freeswitch/spandsp
Packages for Sofia-sip and SpandDSP are available for all supported platforms from our packaging repos.
See all FreeSWITCH commits here: https://freeswitch.org/stash/projects/FS/repos/freeswitch/commits