[Kamailio-Users] T.38 not relayed by RTPproxy

[Ovidiu Sas]

rtpproxy works very well with T.38 (the transport protocol for T.38 is
udptl built on top of udp just like rtp).
Jens, which version of rtpproxy do you use?

On Fri, Aug 1, 2008 at 2:49 PM, Alex Balashov <abalashov at evaristesys.com> wrote:
> T.38 is not RTP, so I am not sure why one would expect them to be relayed.
>
> Jens Carl wrote:
>
>> Hello List,
>>
>> I have problem with T.38 and the RTPproxy by one of mine scenarios.
>> The first one works flawless and looks like that:
>>
>> Linksys ATA -> NAT -> OpenSer/RTPproxy -> T.38-GW (Asterisk)
>>
>> The second one on the other hand don't work how it should and looks like
>> this one:
>>
>> T.38-GW -> SIP-Proxy -> Openser/RTPproxy -> NAT -> Linksys ATA.
>>
>> The normal RTP stream is opened and they switch over to T.38, but the
>> RTPproxy isn't sending out the received T.38 packets from the ATA.
>>
>> If the OpenSER is getting a re-INVITE I call the function
>> force_rtp_proxy(). I already tried the function with 'l' parameter but
>> then none of the scenarios are working.
>>
>> Why is the RTPproxy not relaying like in the 1st scenario?
>>
>> Which flag should I use to get the things working?
>>
>> Why is RTPproxy using the same ports like it used for the normal RTP
>> traffic?
>> I thought when I call force_rtp_proxy() a 2nd time I create a new
>> session with different ports?
>> Can I force the RTPproxy to use different ports?
>>
>> If someone needs a PCAP-trace I can provide this.
>>
>> Many thanks
>>
>>       Jens
>>
>>
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>
>
> --
> Alex Balashov
> Evariste Systems
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