Thanks Mike for detailed explanation.  Best regards, /Kaiduan On Thursday, October 24, 2019, 02:23:45 p.m. EDT, Mike Jerris <mike@freeswitch.org> wrote: Newest release defaults to 1.2 as long as you use an openssl that supports it (note that this is not the case on some older distros but should be on at least buster).  That was not the case in previous releases… You can check release notes to confirm version but I think that change was in 1.10.0.  The commit note and release notes will have more details on this. On Oct 22, 2019, at 7:55 AM, kaiduan xie via FreeSWITCH-users <freeswitch-users@lists.freeswitch.org> wrote: From: kaiduan xie <kaiduanx@yahoo.ca> Subject: webrtc DTLS1.2 support in Freeswitch Date: October 22, 2019 at 7:54:37 AM MDT To: FreeSWITCH Users Help <freeswitch-users@lists.freeswitch.org> Hi, Does Freeswitch support DTLS 1.2 for webrtc? If yes, which version supports DTLS 1.2? Google will drop DTLS1.0 support in M81 per https://bugs.chromium.org/p/webrtc/issues/detail?id=10261 Thanks, /Kaiduan