Thanks for answering Faisal. I configured stun on my linphone clients but it didn't solve the problem. I've also disabled SIP ALG on my router but didn't make any difference. In this scenario which I'm using bypass-media feature of Freeswitch, everything works fine when clients are on the same network. But it does not work if one is another another remote network such as mobile data. In you are using linphone mobile clients make sure you have added "stun.linphone.org" in account specific stun settings,If you need both ZRTP & NAT handling keep media in proxy mode. On Fri, Feb 21, 2020, 6:29 AM I K via FreeSWITCH-users <freeswitch-users@lists.freeswitch.org> wrote: ---------- Forwarded message ---------- From: I K <iriik@yahoo.com> To: "freeswitch-users@lists.freeswitch.org" <freeswitch-users@lists.freeswitch.org> Cc: Bcc: Date: Sat, 15 Feb 2020 22:11:12 +0000 (UTC) Subject: RTP not transmitting over NAT Hi every one, I'm new to Freeswitch and I'm having some difficulty configuring it, despite reading the documents. I have a Freeswitch running on a server with public IP and several Linphone android clients running behind NAT.How should I configure it to transfer audio and video and use ZRTP if one client is on a LAN behind NAT and the other client is using mobile data?! Things I've acheived so far:1- bypass-media = false and proxy-media = false:In this mode audio works but when I turn on video no request is sent to the other phone. It other use just has to know when to turn on the camera to receive video. and of course ZRTP does not work well. 2- bypass-media = false and proxy-media = true:audio works but video shows blank3- bypass-media = true and proxy-media = false:If both clients are on the same LAN everything works fine, but if one client connects via mobile data, they can still call each other but no media is transferred and the call is dropped after 30s. I've been working on this scenario for over a week and I'm desperate to make it work. Thanks in advance for your help. ---------- Forwarded message ---------- From: I K via FreeSWITCH-users <freeswitch-users@lists.freeswitch.org> To: "freeswitch-users@lists.freeswitch.org" <freeswitch-users@lists.freeswitch.org> Cc: Bcc: Date: Thu, 20 Feb 2020 17:29:02 -0800 (PST) Subject: [Freeswitch-users] RTP not transmitting over NAT _________________________________________________________________________ The FreeSWITCH project is sponsored by SignalWire https://signalwire.com Enhance your FreeSWITCH install with disruptive priced SMS and PSTN services. Build your next product on our scalable cloud platform. Join our online community to chat in real time https://signalwire.community Professional FreeSWITCH Services sales@freeswitch.com https://freeswitch.com Official FreeSWITCH Sites https://freeswitch.com/oss https://freeswitch.org/confluence https://cluecon.com FreeSWITCH-users mailing list FreeSWITCH-users@lists.freeswitch.org http://lists.freeswitch.org/mailman/listinfo/freeswitch-users UNSUBSCRIBE:http://lists.freeswitch.org/mailman/options/freeswitch-users https://freeswitch.com _________________________________________________________________________ The FreeSWITCH project is sponsored by SignalWire https://signalwire.com Enhance your FreeSWITCH install with disruptive priced SMS and PSTN services. Build your next product on our scalable cloud platform. Join our online community to chat in real time https://signalwire.community Professional FreeSWITCH Services sales@freeswitch.com https://freeswitch.com Official FreeSWITCH Sites https://freeswitch.com/oss https://freeswitch.org/confluence https://cluecon.com FreeSWITCH-users mailing list FreeSWITCH-users@lists.freeswitch.org http://lists.freeswitch.org/mailman/listinfo/freeswitch-users UNSUBSCRIBE:http://lists.freeswitch.org/mailman/options/freeswitch-users https://freeswitch.com