Hi Brian,

That makes sense since the EC2 has no network interface for the public IP that FS can bind to.
So what is RTP auto switching actually doing when it says:

Auto Changing audio port from 172.31.x.x:31196 to 52.17.x.x:31196

Is it just amending udp packet headers but not actually rerouting anything?

Thanks,
Sean

>"Freeswitch always sends RTP traffic from it's private IP", Because thats
>all it CAN do, the public IP isn't directly bound on the system so it
>can't send from the public IP.

>/b


On Mon, Jul 17, 2017 at 4:33 AM, Sean Ingham <sean at missionlabs.co.uk> wrote:

> Hi,
> I'm running FreeSwitch on an AWS EC2 with config as per the wiki EC2 page.
>
> external_rtp_ip & bind_server_ip are both set to the box's public AWS
> Elastic IP - as is ext_rtp_ip on all profiles.
>
> I'm running a WebRTC gateway also in AWS. I can see that SDPs from
> Freeswitch to the gateway all include Freeswitch's public IP as desired,
> however when the call is answered Freeswitch always sends RTP traffic from
> it's private IP. Then a second or 2 later Freeswitch sees incoming RTP from
> the gateway to it's public IP address and RTP auto swtiching behaviour
> kicks in, resulting in a line like this in FS logs:
>
> switch_rtp.c:6954 Auto Changing audio port from 172.31.x.x:31196 to
> 52.17.x.x:31196
>
> As it happens, the gateway is able to receive media from either private or
> public IP as the box is in the same subnet, but in around 30% of cases at
> the point this switching occurs the call audio drops. (I'm guessing the
> gateway has issues stitching together the rtp streams from 2 different
> sources.)
>
> I've tried experimenting with the disable_rtp_auto_switch parameter, but
> seems to me a cleaner solution would be to have Freeswitch send RTP from
> it's public IP in the first place, and I can't understand why it's not
> doing that given it's negotiated to use the public IP in it's SDP.
>
> Can anyone provide any explanation for the behaviour I'm currently seeing,
> or suggest how I can get FS to set the initial outgoing RTP port correctly?
>
>
> Thanks,
> Sean.
>
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