Hi Arslan, i have come across quite a few weird things regarding Freeswitch – MS Teams Interconnection. Maybe you can provide your sofia-profile xml that connects to MS Teams. That would help. Regards, Von: FreeSWITCH-users <freeswitch-users-bounces@lists.freeswitch.org> Im Auftrag von Arslan Saeed Gesendet: Mittwoch, 27. Januar 2021 23:18 An: freeswitch-users@lists.freeswitch.org Betreff: [Freeswitch-users] Freeswitch Interop issue with MS Teams Hi All. Has anyone seen any weird signalling behaviour of Freeswitch when interworking with MS Teams server? We have seen a few weird things where freeswitch is apparently not passing the signaling messages from one leg to the other in B2BUA mode. In one of the weird cases, freeswitch decides to not relay the SIP Bye message from the called party to the caller and just consumes it (resulting in the call to stay up from the caller's side). This has happened randomly as well as in one particular call scenario when a feature is activated on ms teams side. However SIP signaling wise we cannot see any difference between a good call (where SIP bye is relayed to caller by freeswitch and the one where it decides to stomp on it). Our freeswitch version is "FreeSWITCH (Version 1.10.5 -release-17-25569c1631 64bit)" I am not including any PCAPS or detailed configuration of freeswitch in the post yet and can provide it if required. Any ideas or link to some useful resources please? Thanks Arslan -- <https://overthewire.com.au/email-link/otwbanner>