Try using the following in your profile <param name="disable-rtp-auto-adjust" value="true"/> Worked for me in FS 1.6 along with 3pcc. The message that was previously closely associate to the issue occurrence “Auto Changing port from xxx.xxx.xxx.xxxx:yyyyy to xxx.xxx.xxx.xxxx:yyyyy” was not present anymore after workaround was applied. You may also need rtp_manual_rtp_bugs=accept_any_packets There was a wiki page listing all the rtp workarounds against peer bugs in a single concise document - however seems hard to find now. ---------------------------------------------------------------------- Message: 1 Date: Fri, 24 May 2019 13:54:09 +0100 From: Callum Guy <callum.guy@x-on.co.uk> To: FreeSWITCH Users Help <FreeSWITCH-users@lists.freeswitch.org> Subject: [Freeswitch-users] Late SDP causing switch to sendonly mode - one way calls (3PCC?) Message-ID: <CAFjCFz=7W61X2EQiCn6fz2Vn6MpHtsHxP6-SPtQphf8cUbDVKA@mail.gmail.com> Content-Type: text/plain; charset="utf-8" Hi All, In short I have an established bridged call out to a 3rd party SIP IVR - this IVR appears to be performing 3pcc meaning I am receiving RE-INVITEs w/o SDP as the call plays prompts, goes to queue and when it is answered. For each INVITE FreeSWITCH responds with 200 with SDP and we get an ACK back with SDP. During the queue phase the ACK SDP contains a=sendonly - all previous SDP have implied sendrecv on both sides. All is OK at this stage. When the call is finally answered we get an INVITE w/o SDP and FreeSWITCH responds with SDP including a=sendonly, to which the remote replies a=sendrecv. Hence we get one way audio at the time when the conversation should be starting. Can anyone help explain why FreeSWITCH would be switching to sendonly mode? I have enable_3pcc=true configured but otherwise this is a fairly standard/vanilla configuration. The behaviour I would expect is for FreeSWITCH to continue to omit the attribute and imply sendrecv. Are there specific variables which might allow me to manage the SDP attributes? Please find a trace log attached. Platform: FreeSWITCH Version 1.8.5-6-31281a0bf1~64bit (-6-31281a0bf1 64bit) Linux my.network 4.9.0-8-amd64 #1 SMP Debian 4.9.144-3.1 (2019-02-19) x86_64 GNU/Linux Let me know if I can offer any more details regarding the implementation, thanks, Callum --