[asterisk-users] asterisk t.38 fax failed

[Ricardo Carvalho]

In sip.conf add to [general] context and to every peer context that you 
want to register in Asterisk to use T.38 the following lines:
t38pt_udptl=yes
t38pt_rtp=no
t38pt_tcp=no

In udptl.conf file I have the following configurations:
[general]
udptlstart=4000
udptlend=4999
T38FaxUdpEC = t38UDPRedundancy
T38FaxMaxDatagram = 400
udptlfecentries = 3
udptlfecspan = 3


Good luck,

Ricardo.








Kokfoo Soo wrote:
> Ricardo,
> Thanks, could you please share some of your t.38 passthrough 
> configuration in sip.conf and also udptl.conf?
>
> Thanks,
>
> */Ricardo Carvalho <rcarvalho at iric.up.pt>/* wrote:
>
>     No, T.38 doesn't work with Asterisk. Only works with Asterisk
>     t38passthrough patch that you can find at URL:
>     http://bugs.digium.com/file_download.php?file_id=9335&type=bug
>     For me it only worked well with patch for version 1.2.4 of Asterisk.
>
>     Regards,
>
>     Ricardo.
>
>
>
>
>
>
>     Kokfoo Soo wrote:
>     > Is T.38 fax work through Asterisk? I have the config below in my
>     > sip.conf, but the fax doesn't work and give me the CLI lines
>     below. My
>     > current version is 1.2.10. Please help.
>     >
>     > [Inboundtopbx]
>     > type=friend
>     > context=pbx
>     > host=10.18.188.84
>     > insecure=port
>     > dtmfmode=rfc2833
>     > canreinvite=no
>     > disallow=all
>     > allow=g729
>     > allow=ulaw
>     > t38pt_udptl=yes
>     > t38pt_rtp=no
>     > t38pt_tcp=no
>     >
>     > [OutboundfromPBX]
>     > type=peer
>     > host=10.18.161.222
>     > canreinvite=no
>     > dtmfmode=rfc2833
>     > disallow=all
>     > allow=g729
>     > qualify=yes
>     > t38pt_udptl=yes
>     > t38pt_rtp=no
>     > t38pt_tcp=no
>     >
>     > <-- SIP read from 10.18.188.84:50096:
>     > ACK sip:17815057304 at 10.18.161.237:5060 SIP/2.0
>     > Via: SIP/2.0/UDP 10.18.188.84:5060
>     > From: ;tag=19D429E8-2084
>     > To: ;tag=as3c87a22e
>     > Date: Tue, 05 Sep 2006 19:42:28 GMT
>     > Call-ID: 7F23A1F9-3C4D11DB-A303B82B-9F58A83F at 10.18.188.84
>     > Max-Forwards: 6
>     > Content-Length: 0
>     > CSeq: 101 ACK
>     >
>     >
>     > --- (9 headers 0 lines)---
>     > Sep 5 15:30:31 NOTICE[25233]: rtp.c:564 ast_rtp_read: Unknown RTP
>     > codec 100 received
>     > Sep 5 15:30:32 NOTICE[25233]: rtp.c:564 ast_rtp_read: Unknown RTP
>     > codec 100 received
>     > Sep 5 15:30:32 NOTICE[25233]: rtp.c:564 ast_rtp_read: Unknown RTP
>     > codec 100 received
>     > Sep 5 15:30:32 NOTICE[25233]: rtp.c:564 ast_rtp_read: Unknown RTP
>     > codec 100 received
>     > Sep 5 15:30:34 WARNING[6839]: chan_sip.c:3475 process_sdp: Unknown
>     > SDP media type in offer: image 16406 udptl t38
>     >
>     >
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