Hi Tihomir, Thankyou very much for the reply. I have tried pre_answer (which sends the 183 with sdp) and the ring_ready (which as you know generates a 180 ringing ) but I only ever see the 183 sent back to the A leg, not both as I thought this was as design in Sofia? Does this work for you or am I missing something? Thanks! Jon Get Outlook for iOS<https://aka.ms/o0ukef> _____________________________ From: Tihomir Culjaga <tculjaga@gmail.com<mailto:tculjaga@gmail.com>> Sent: Wednesday, March 21, 2018 7:02 am Subject: Re: [Freeswitch-users] 183 early media" followed by 180 Ringing From Mobile Carriers To: FreeSWITCH Users Help <freeswitch-users@lists.freeswitch.org<mailto:freeswitch-users@lists.freeswitch.org>> Hi, im not sure about the callflow you have so i suppose its an incoming call from a carrier to freeswitch and you want to generate an inband ringback to the calling user. In that case you use pre_answer followed by ring_ready. Of course you set ringback var to a tone or wav file so freeswitch can actually generate that inband. Sent from my iPhone On 19 Mar 2018, at 20:41, Jonathan Hunter <hunterj91@hotmail.com<mailto:hunterj91@hotmail.com>> wrote: Hi Guys, Sorry to bring this up again but I see it when performing interopt testing with mobile carriers. A number of them due to ISUP interworking, have gateways that generate a 183 with SDP, then a 180ringing. I understand from ready for example this jira case FreeSWITCHFS-3859 SOFIA "183 early media" followed by "180 Ringing" where this is done by design. I just wondered if this position had changed and if there is a configuration parameter/option that can allow any early media message to be sent back to A leg by freeswitch, in particular a 183 with SDP, then a subsequent 180 ringing, as carriers tend to want to see both. Many thanks Jon _________________________________________________________________________ Professional FreeSWITCH Consulting Services: consulting@freeswitch.org<mailto:consulting@freeswitch.org> http://www.freeswitchsolutions.com Official FreeSWITCH Sites http://www.freeswitch.org http://confluence.freeswitch.org http://www.cluecon.com FreeSWITCH-users mailing list FreeSWITCH-users@lists.freeswitch.org<mailto:FreeSWITCH-users@lists.freeswitch.org> http://lists.freeswitch.org/mailman/listinfo/freeswitch-users UNSUBSCRIBE:http://lists.freeswitch.org/mailman/options/freeswitch-users http://www.freeswitch.org