Hi! I am trying to test Freeswitch WebRTC capabiities. We are using JsSIP try web site (http://tryit.jssip.net/) and Zoiper Our servers are located on Amazon EC2 so, there is a NAT firewall between them. Freeswitch version is: FreeSWITCH Version 1.5.15b+git~20150404T093935Z~6eb59c7119~64bit (git 6eb59c7 2015-04-04 09:39:35Z 64bit) - TODAY MASTER. When testing WebRTC and Softphones, I find that I am able to call from a softphone to a WebRTC ext without problems. But when calling to from the WeRTC ext to the softphone it always fails with a Bad Media Description Can someone try to help in here? My relevant vars.xml lines: <X-PRE-PROCESS cmd="set" data="domain=ve001.voice.cibersys.com"/> <X-PRE-PROCESS cmd="set" data="domain_name=ve001.voice.cibersys.com"/> <X-PRE-PROCESS cmd="set" data="hold_music=local_stream://moh"/> <X-PRE-PROCESS cmd="set" data="use_profile=external"/> <X-PRE-PROCESS cmd="set" data="rtp_secure_media=optional:AES_CM_128_HMAC_SHA1_32"/> <X-PRE-PROCESS cmd="set" data="global_codec_prefs=OPUS,PCMA,PCMU,G729,G722,H264,VP8,H263,H263-1998,H263-2000"/> <X-PRE-PROCESS cmd="set" data="outbound_codec_prefs=OPUS,PCMA,PCMU,G729,G722,H264,VP8,H263,H263-1998,H263-2000"/> <X-PRE-PROCESS cmd="set" data="bind_server_ip=54.186.52.106"/> <X-PRE-PROCESS cmd="set" data="external_rtp_ip=54.186.52.106"/> <X-PRE-PROCESS cmd="set" data="external_sip_ip=54.186.52.106"/> <X-PRE-PROCESS cmd="set" data="sip_tls_version=tlsv1,tlsv1.1,tlsv1.2"/> <X-PRE-PROCESS cmd="set" data="sip_tls_ciphers=ALL:!ADH:!LOW:!EXP:!MD5:@STRENGTH"/> <!-- Internal SIP Profile --> <X-PRE-PROCESS cmd="set" data="internal_auth_calls=true"/> <X-PRE-PROCESS cmd="set" data="internal_sip_port=5090"/> <X-PRE-PROCESS cmd="set" data="internal_tls_port=5091"/> <X-PRE-PROCESS cmd="set" data="internal_ssl_enable=true"/> <X-PRE-PROCESS cmd="set" data="internal_ssl_dir=/opt/fs-20150407/certs/"/> <!-- External SIP Profile --> <X-PRE-PROCESS cmd="set" data="external_auth_calls=false"/> <X-PRE-PROCESS cmd="set" data="external_sip_port=5070"/> <X-PRE-PROCESS cmd="set" data="external_tls_port=5071"/> <X-PRE-PROCESS cmd="set" data="external_ssl_enable=false"/> My internal_profile <param name="liberal-dtmf" value="true"/> <param name="inbound-codec-prefs" value="$${global_codec_prefs}"/> <param name="outbound-codec-prefs" value="$${global_codec_prefs}"/> <param name="rtp-timer-name" value="soft"/> <param name="rtp-ip" value="$${local_ip_v4}"/> <param name="sip-ip" value="$${local_ip_v4}"/> <param name="aggressive-nat-detection" value="true"/> <param name="multiple-registrations" value="true"/> <param name="ext-rtp-ip" value="$${external_rtp_ip}"/> <param name="ext-sip-ip" value="$${external_sip_ip}"/> <param name="NDLB-received-in-nat-reg-contact" value="true"/> <param name="NDLB-force-rport" value="true"/> <param name="NDLB-broken-auth-hash" value="true"/> <param name="enable-timer" value="false"/> <param name="auth-calls" value="true"/> <param name="rtp-ip" value="$${local_ip_v4}"/> <param name="sip-ip" value="$${local_ip_v4}"/> <param name="rtp-timeout-sec" value="300"/> <param name="rtp-hold-timeout-sec" value="1800"/> <param name="wss-binding" value=":7443"/> Thanks you as usual for your kind help. -- Víctor E. Medina M. Platform Architect / Chief Infrastructure +58424 291 4561 BB #79A8AFA2 @VMCibersys