Hello. External profile is bind to port 5080 on public IP of FS server connected directly to server. Server has a public IP for serving external connections to some local services like IVR without any registration. client -> internet -> FS -- is ok. client -> nat -> internet -> FS -- no sound. I don't need any client registration for this calls, so no directory users are used. The external sip profile is from git. Only sip-ip and rtp-ip is equal to ext-sip-ip and ext-rtp-ip and is equal to external IP of FS server. When a client behind a nat calls, in FS log remote SDP shows client's local lan ip, not public IP of the router thru which client get access to internet. Also channel name is sofia/external/internal-ip. I've tried aggressive-nat-detection, NDLB-force-rport, NDLB-sendrecv-in-session in sofia profile "external" ad even: <extension name="sip_nat_detected" continue="true"> <condition field="${sip_nat_detected}" expression="^true$"> <action application="set" inline="true" data="sip-force-contact=NDLB-connectile-dysfunction"/> </condition> </extension> in public.xml to no available. I tried two different soft phones. One does not get audio at all, other softphone get audio after about 5 sec, and in log I see that remote SDP IP had changed to client's public ip. Interesting thing that the same softphone which never gets audio, does not have problem to connect to FS conference server. What I am missing? -- Mimiko desu.