Hello all, Help a n00b out. I have been trying to get an instance of FreeSwitch running up in the Amazon EC2 cloud. I have successfully gotten the package built following the wiki and archives of this list. I can get x-lite to register with the switch and it will set up calls out on my asterlink account. The problem is that there is no audio transfer (so I am assuming RTP problem). The setup: Firewall open ports tcp 0-65535 udp 0-65535 --- I tried so many combinations unsuccessfully, I finally just blasted open everything. In conf/freeswitch.xml (174.129.201.96 is assigned elastic IP address) <X-PRE-PROCESS cmd="include" data="vars.xml"/> #set "external_rtp_ip=174.129.201.96" <section name="configuration" description="Various Configuration"> <X-PRE-PROCESS cmd="include" data="autoload_configs/*.xml"/> </section> In conf/autoload_configs/sofia.conf.xml <param name="ext-rtp-ip" value="$${external_rtp_ip}"/> <param name="ext-sip-ip" value="$${external_rtp_ip}"/> Internal network IP assignment: Name: domU-12-31-39-00-84-B6.compute-1.internal Address: 10.254.139.68 When I setup a call through asterlink, I see this in the system log: Ring SDP: v=0 o=FreeSWITCH 1241648830 1241648831 IN IP4 10.254.139.68 s=FreeSWITCH c=IN IP4 10.254.139.68 t=0 0 m=audio 17654 RTP/AVP 0 101 a=rtpmap:0 PCMU/8000 a=rtpmap:101 telephone-event/8000 a=fmtp:101 0-16 a=silenceSupp:off - - - - a=ptime:20 a=sendrecv I do not know SDP parameters off the top of my head, but I am assuming that it is telling Asterlink to route the RTP to the internal network IP address and not the external one.