HI, I’m trying to get FS running in Docker, which largely was pain free (i know, i know, VMs, etc), but I can’t get my head around what is going on with RTP. Ive set ext-rtp-ip and it seems to be taking affect: freeswitch@7ad22635059e> sofia status profile internal ================================================================================================= Name internal Domain Name N/A Auto-NAT false DBName sofia_reg_internal Pres Hosts 172.17.0.5,172.17.0.5 Dialplan XML Context trusted Challenge Realm auto_from RTP-IP 172.17.0.5 Ext-RTP-IP 192.168.1.168 SIP-IP 172.17.0.5 Ext-SIP-IP 192.168.1.168 URL sip:mod_sofia@192.168.1.168:5060 BIND-URL sip:mod_sofia@192.168.1.168:5060;maddr=172.17.0.5;transport=udp,tcp HOLD-MUSIC local_stream://moh OUTBOUND-PROXY N/A CODECS IN G729,PCMU,PCMA CODECS OUT G729,PCMU,PCMA TEL-EVENT 101 DTMF-MODE none CNG 13 SESSION-TO 0 MAX-DIALOG 0 NOMEDIA false LATE-NEG true PROXY-MEDIA false ZRTP-PASSTHRU true AGGRESSIVENAT false CALLS-IN 2 FAILED-CALLS-IN 2 CALLS-OUT 0 FAILED-CALLS-OUT 0 REGISTRATIONS 0 but when a call is placed i seems to be incorrect in the SDP 2016-04-06 16:29:49.011107 [DEBUG] mod_sofia.c:2353 Ring SDP: v=0 o=FreeSWITCH 1459942605 1459942606 IN IP4 172.17.0.5 s=FreeSWITCH c=IN IP4 172.17.0.5 t=0 0 m=audio 17584 RTP/AVP 8 101 a=rtpmap:8 PCMA/8000 a=rtpmap:101 telephone-event/8000 a=fmtp:101 0-16 a=ptime:20 a=sendrecv Shouldn’t the SDP reflect the Ext-RTP-IP ? Im sure i’ve missed some sort of config setting or have gone snow blind!. fs version is FreeSWITCH (Version 1.6.7 -14-d38d065 64bit) Any ideas will be greatly received. Thanks Oz.