[OpenSER-Users] T.38 and RTP Read too short

Bogdan-Andrei Iancu bogdan at voice-system.ro
Wed Jul 9 17:31:36 CEST 2008


Hi Jens,

RTPproxy does not change anything in the RTP stream (not event the size 
of the packages), so I think the guilty one is not the rtpproxy - it 
just a transparent relay.

Have you tried this directly, with no rtpp in the middle?

Regards,
Bogdan

Jens Carl wrote:
> Hey everybody,
>
> I use OpenSER (openser 1.3.2-tls (x86_64/linux), svnrevision: 2:4420) 
> and the RTPproxy (1.1) and everything works fine expect for one thing.
>
> If I try to use T.38 with following scenario:
>
> SIP-FAX1 (NAT) <-> RTPProxy+OpenSER <-> Asterisk <-> Carrier
>
> the Asterisk always produce this kind of warning:
> 'WARNING[1493]: rtp.c:1145 ast_rtp_read: RTP Read too short'.
>
> The SIP-signaling with the re-INVITE works fine. If I get an re-INVITE I 
> call the force_rpt_proxy( 'l' ).
>
> Has anybody an idea what I should change in the RTPproxy to get this 
> scenario working?
>
> Thanks for your help,
>
>      Jens
>
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