Hi, I’d read the manuals and configure my sofia profile to work with the external IP in the ext-rtp-ip setting. <param name="stun-enabled" value="true"/> <param name="stun-auto-disable" value="false"/> <param name="ext-rtp-ip" value="stun:stun.freeswitch.org" /> The Freeswitch is started with the parameter –nonat In the pcap trace is no STUN request visible. I try to restart the Freeswitch, restart the profile, do an outbound call, but there is no STUN request. If I try to get my external IP via the CLI cmd “stun stun.freeswitch.org”, then works it successfully. The status output of the profile is: ================================================================================================= Name SBC2_B2Bua Domain Name N/A Auto-NAT false DBName sofia_reg_SBC2_B2Bua Pres Hosts Dialplan XML Context SBC2_SP_outbound Challenge Realm auto_to RTP-IP MY_LOCAL_IP Ext-RTP-IP stun:stun.freeswitch.org SIP-IP MY_LOCAL_IP Ext-SIP-IP MY_LOCAL_IP URL sip:mod_sofia@MY_LOCAL_IP:4901 BIND-URL sip:mod_sofia@MY_LOCAL_IP:4901;maddr=MY_LOCAL_IP;transport=udp,tcp HOLD-MUSIC local_stream://moh OUTBOUND-PROXY N/A CODECS IN OPUS,PCMU,PCMA,VP8 CODECS OUT OPUS,PCMU,PCMA,VP8 TEL-EVENT 98 DTMF-MODE rfc2833 CNG 13 SESSION-TO 0 MAX-DIALOG 0 NOMEDIA false LATE-NEG true PROXY-MEDIA false ZRTP-PASSTHRU false AGGRESSIVENAT false CALLS-IN 0 FAILED-CALLS-IN 0 CALLS-OUT 0 FAILED-CALLS-OUT 0 REGISTRATIONS 0 Thanks a lot!!! Alex