Hi, Is it possible to disable or not to send prack messages? I've set in the sip profile the option enable-100rel=false, but FS still sends the prack message... My problem is that after receive the 180 from the remote side, FS sends the prack message and the remote side reply with SIP/2.0 481 Call/Transaction Does Not Exist, This make FS to cancel the call. I know that this is an issue on the remote side... but i want to avoid this message if possible. Full sip trace in https://pastebin.freeswitch.org/24562 Thanks, António