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

[Kees Jan Koster]

Dear Brian,

Thank you for your response. I have reproduced the problem with fs_cli and ngrep running.

fs_cli log http://pastebin.freeswitch.org/22883 Please find some config, status and version info at the very end of that output.

ngrep output http://pastebin.freeswitch.org/22884

Rough setup sketch:

[custom client] ---- [ custom proxy ][ fs ] ---- [ SIP softphone ]

 84.241.196.84        public  54.72.22.25         192.168.240.26 
                      private 10.20.3.26

The custom proxy talks SIP with FS to do signalling for the custom client. The custom client talks RTP directly to FS and the custom proxy is not involved in RTP. the custom proxy and FS share the machine.

The SIP softphone leg gets its RTP rewritten (http://pastebin.freeswitch.org/22883 line 253) but the custom client RTP is not. When I use PCMA on both legs the custom client's RTP does get rewritten.

I note that in spite of ext-rtp-ip being set to 54.72.22.25, FS advertises "c=IN IP4 10.20.3.26" in the SDP around line 203 of http://pastebin.freeswitch.org/22884 Thus, the custom proxy rewrites the SDP to read 54.72.22.25.

Kees Jan

On 17 Jul 2014, at 15:54, Brian West <brian at freeswitch.org> wrote:

> 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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> -- 
> Brian West
> brian at freeswitch.org
> 
> 
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> 
> 
> 
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--
Kees Jan

http://java-monitor.com/
kjkoster at kjkoster.org
+31651838192

Human beings make life so interesting. Do you know that in a universe so full of wonders,
they have managed to invent boredom. Quite astonishing... -- Terry Pratchett

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