[Freeswitch-users] RTP port rewriting stops working when combined with transcoding?

[Brian West]

Links to some sip traces WITH the freeswitch logs in all these cases would
be most helpful, Since your FreeSWITCH is behind nat, Are you setting the
ext-sip-ip and ext-rtp-ip along with the local-network-acl?  (Also you must
prefix the ext-*-ip elements with autonat: if you wish to dynamically lie
about the IP depending if the endpoint is behind nat with FS or outside the
nat ie thats what local-network-acl is for)


On Wed, Jul 16, 2014 at 7:47 AM, Kees Jan Koster <kjkoster at gmail.com> wrote:

> Dear All,
>
> I am trying to figure out why I see what I see.
>
> When I make a call using the same codec (say, PCMA/8000 on both sides),
> FreeSwitch rewrites the RTP stream's IP address and port for me. That I
> like, since my FreeSwitch is behind NAT.
>
> From the logs:
>
> 2014-07-16 12:32:36.815907 [INFO] switch_rtp.c:3738 Auto Changing port
> from 1.2.3.4:4040 to 5.6.7.8:4040
> 2014-07-16 12:32:36.995906 [INFO] switch_rtp.c:3738 Auto Changing port
> from 9.10.11.12:12345 to 13.14.15.16:41730
>
> Now, when I try to use two different codecs, this behaviour stops.
>
> From the logs and without changing the configuration or restarting
> FreeSwitch:
>
> 2014-07-16 12:35:36.495902 [INFO] switch_rtp.c:3738 Auto Changing port
> from 1.2.3.4:4042 to 5.6.7.8:4042
>
> The other line is missing and ngrep reveals how FreeSwitch stubbornly
> sends RTP audio to the wrong port and IP address.
>
> Further testing shows:
>
>   PCMA  -> PCMA: IP/port is rewritten
>   SILK  -> PCMA: IP/port is *not* rewritten
>   GSM   -> PCMA: IP/port is rewritten
>   Speex -> PCMA: IP/port is *not* rewritten
>
> How can I have transcoding *and* RTP IP/port rewriting work at the same
> time, please?
>
> Is this a per-codec thing?
>
> --
> Kees Jan
>
> http://java-monitor.com/
> kjkoster at kjkoster.org
> +31651838192
>
> Change is good. Granted, it is good in retrospect, but change is good.
>
>
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>
> 
> 
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>


-- 

*Brian West*
brian at freeswitch.org


*Twitter: @FreeSWITCH , @briankwest*
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