[Freeswitch-users] switch_rtp.c - Auto Changing Port

David Ponzone david.ponzone at ipeva.fr
Mon Sep 6 06:33:27 PDT 2010

First, this process should happen quicker.
If it doesn't, it's probably because FS does not receive any RTP  
traffic from your phone.
Perhaps your cellular network is doing "things" in order to prevent  

FS can't use the external IP from the start.
FS has no way to know the exact port it should use to reach a specific  
device behind NAT, because until this device sends RTP, the port does  
not exist yet.

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Le 06/09/2010 à 02:59, Ross McKillop a écrit :

> Hi,
> I have a number of SIP endpoints behind NAT on a cellular network  
> and am experiencing some odd behaviour with RTP traffic.
> No audio at all is present on the call for about the first 10s or  
> so, and then the following is shown in the console;
>> 2010-09-06 01:04:53.101801 [INFO] switch_rtp.c:2049 Auto Changing  
>> port from to
> After which the call works perfectly.
> Is there any way I can force this process to happen quicker, within  
> the first second of the call? or is it possible to force FreeSWITCH  
> to use the external IP from the start?
> Any assistance you can offer would be much appreciated.
> Best Regards,
> Ross
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