[Freeswitch-users] Amazon EC2 no audio

Dave Grootwassink stackofstuff.dg at gmail.com
Wed May 6 21:20:10 PDT 2009

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   (  is assigned elastic IP address)


  <X-PRE-PROCESS cmd="include" data="vars.xml"/>

  #set "external_rtp_ip="  

  <section name="configuration" description="Various Configuration">

    <X-PRE-PROCESS cmd="include" data="autoload_configs/*.xml"/>




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





When I setup a call through asterlink, I see this in the system log:


Ring SDP:


o=FreeSWITCH 1241648830 1241648831 IN IP4


c=IN IP4

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 - - - -




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.






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