You could simply let the RTP traffic to flow directly between FS and
endpoints (no need for rtpproxy).
All you need to do is:
 - forward the appropriate RTP ports to FS;
 - fix the private IP in SDP by replacing it with the public IP for
the inbound rtp streams (to FS).

-ovidiu

On Mon, Feb 16, 2015 at 11:30 AM, Giovanni Maruzzelli <gmaruzz@gmail.com> wrote:
> dear Kamailians,
>
> I have Kamailio+rtpproxy in front of FreeSWITCH.
>
> Kamailio and FreeSWITCH are on the same private network.
> Public Internet IP address ports are redirected to Kamailio and
> rtpproxy (same situation as in Amazon EC2).
> Clients comes from Internet, and make calls to Internet, SIP signaling
> passing through FreeSWITCH (eg: A leg incoming INVITE, FreeSWITCH
> originate an outbound B leg INVITE, and then bridge the legs).
>
> Using rtpproxy with -A "advertise" patch from Daniel, this topology
> works fine in a "traditional" telco way: rtp goes from caller to
> rtpproxy to callee, and viceversa.
>
> Now I want to maintain FreeSWITCH in the middle of rtp flow all the
> time, in a pure b2bua way, so it can control and analyze the media
> streams.
>
> So, I need rtpproxy to act paying attention to direction, as in
> caller->rtpproxy->freeswitch->rtpproxy->callee (and viceversa).
>
> Normally I would use Kamailio multihomed and rtpproxy in bridging
> mode. But I cannot have a NIC on the public address.
>
> How I can use the "ie" "ei" feature of rtpproxy in an Amazon-EC2 like
> environment? (eg: no public address attached to machine, but ports
> redirection from public address).
>
> I read this trick from Hugh Waite:
>
> "I have used rtpproxy (with the advertised address patch) in Amazon to
> bridge media between internet facing and private subnets in a VPC.
> I found that I couldn’t use different advertised addresses depending
> on which direction the signalling was going on a single private IP
> address. I worked around this by allocating a second private ip
> address to the instance and used that in the ‘bridge’.
> -A 54.86.X.X/10.0.1.15 –l 10.0.1.10/10.0.1.15"
>
> Can you explain how to use this trick, or another way (without
> additional addresses is gladly accepted!) to reach the same result
> (rtp always passing through FreeSWITCH) ?
>
> Thank you all in advance,
>
> -giovanni
>
> --
> Sincerely,
>
> Giovanni Maruzzelli
> Cell : +39-347-2665618
>
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