Hi Dragos, Thank you for the fast reply! You are correct in terms of call flow. I am originating from a WebRTC client on Janus, which then sends a SIP invite into FreeSWITCH , I then reply to that to set it to 8K, narrowband, this works perfectly ! 😊 However I then bridge the call out to a carrier, and I want to offer in the SDP the maxplaybackrate=8000, however I cant seem to do this, and this is with and without late-negotiation enabled. Am I missing something or do you have any debug suggestions for me please? Many thanks Jon ---------- Forwarded message ---------- From: Oancea, Dragos <dragos.oancea@vonage.com<mailto:dragos.oancea@vonage.com>> Date: Wed, Jul 12, 2017 at 1:14 PM Subject: Re: [Freeswitch-users] Mod_Opus :Add fmtp maxplaybackrate=8000 in OPUS codec offer.Version 1.6.8-15-99de0ad~64bit To: FreeSWITCH Users Help <freeswitch-users@lists.freeswitch.org<mailto:freeswitch-users@lists.freeswitch.org>> Hi Jon, If both sides follow the RFC , then you should be able to get narrowband end to end. How do you originate the call ? Sounds like you originate a call from a device and then you bridge to the callee, but you have inbound-late-negotiation on, so the OPUS config XML is not loaded, hence fmtp cannot be changed according to config. Regards, Dragos On Wed, Jul 12, 2017 at 1:04 PM, Jonathan Hunter <hunterj91@hotmail.com<mailto:hunterj91@hotmail.com>> wrote: Hi Guys, We are currently testing OPUS and Im looking to lock down things to a maxplaybackrate of 8000HZ. This works fine if FreeSWITCH is the receiver (Offer Answer), however if I then send an invite out from FreeSWITCH (bridge the same call)it doesnt seem to add the fmtp maxplaybackrate=8000 paramater. As when FreeSWITCH answers I see; Media Attribute (a): fmtp:111 useinbandfec=1; maxaveragebitrate=14400; maxplaybackrate=8000; minptime=10 However when I send an Invite offer out I see; Media Attribute (a): rtpmap:111 opus/48000/2 Media Attribute (a): fmtp:111 minptime=10;useinbandfec=1 The OPUS module document seems to suggest we can add this, and if so how can I achieve this, as I have my opus.conf set to; <param name="use-vbr" value="1"/> <param name="use-dtx" value="0"/> <param name="complexity" value="10"/> <param name="maxaveragebitrate" value="14400"/> <param name="maxplaybackrate" value="8000"/> <param name="packet-loss-percent" value="15"/> <param name="keep-fec-enabled" value="1"/> <param name="use-jb-lookahead" value="1"/> <param name="advertise-useinbandfec" value="1"/> And I also set the SIP profile codec list and absolute codec offer to OPUS@8000h, and as I say works great when we answer an offer, but not when we originate. Am I misconfiguring or is this not possible? I know the RFC states the parameter "maxplaybackrate" is a unidirectional receive-only parameter that reflects limitations of the local receiver, however mod_opus documentation seems to suggest we can set it in the offer, so I should be able to add as; maxplaybackrate=8000 Is this possible? I just want to ensure I get narrowband end to end. 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 _________________________________________________________________________ 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 -- Jonathan Hunter Technical Director /Telephony Developer M:(+44) 7917 190 438 Email:jhunter@voxboxcoms.co.uk<mailto:Email%3Ajhunter@voxboxcoms.co.uk>