Hi, I meet a issue about the rtp port. The media port value in the sdp of SIP 200 OK which freeswitch internal sends to ua is always 0, so the media forward is always wrong. What could cause this problem possibly? No matter I set <param name="inbound-bypass-media" value="true"/> or <param name="inbound-proxy-media" value="true"/> The problem always showes. Does the following rtp-ip and ext-rtp-ip set correct? In external.xml, I set both rtp-ip and ext-rtp-ip as $${external_rtp_ip}, is that correct? I am not clear about this two variables in the external.xml and internal.xml external.xml: <param name="rtp-ip" value="$${external_rtp_ip}"/> external.xml: <param name="ext-rtp-ip" value="$${external_rtp_ip}"/> internal.xml: <param name="rtp-ip" value="$${internal_rtp_ip}"/> internal.xml: <param name="ext-rtp-ip" value="$${external_rtp_ip}"/> Thanks, -Congxin