Hi All, Im hoping that the collective experience of the FS Community might be able to help with some interop fun with Skype For Business, specifically where the SFB end sends a bye at around 3 min, after the call has been on hold for ( for most of that time ) I dont see anything obvious in the signalling, but a colleague who is quite experienced with Lync feels it may be related to how we are handling "a=inactive" when the call is on hold. I cant at this point share any of these SIP traces ( mainly because im yet to have this entire scenario tested in our lab ). I guess what Im asking is, does anyone have SFB working well with Freeswitch, and have you tested long periods of silence ( pressing mute in the SFB client ) and long periods of the call on hold. if so, can you potentially share any settings you had to tweak in order to make this work. Sincerely Jay