[asterisk-users] Sending faxes with T.38 problem. Asterisk - 1.6.0.6

[Matthew Fredrickson]

Santiago Gimeno wrote:
> Hello,
> 
> Thanks everybody for the answers.
> 
>  >Could be. Would you post the Cisco config relevant to this?
> 
> dial-peer voice 5 voip
> description ** **
> preference 1
> destination-pattern 1…
> voice-class codec 1
> session protocol sipv2
> session target ipv4:1.1.1.1
> session transport udp
> dtmf-relay rtp-nte
> fax-relay ecm disable

I think, that at least if you're using T.38, you may want to try 
enabling ECM.  ECM can cause significant problems in a high-packet loss, 
non-T.38 environment, but I would think that in a T.38 environment, if 
you can keep ECM enabled, that would be a good thing.

Matthew Fredrickson
Digium, Inc.

> fax nsf 000000
> fax protocol t38 ls-redundancy 0 hs-redundancy 0 fallback pass-through 
> g711alaw
> no vad
> 
> 
>  >And upon further examination... don't put T38CALL in as a variable. It 
> will cause the initial INVITE to only
>  >have T38. Leave it out and things should hopefully reinvite.
> 
> I have removed the T38CALL variable and it looks better but it still 
> doesn't work.
> Now asterisk sends an initial INVITE with audio media in the SDP. The 
> CISCO accepts this call after contacting the fax-machine. Then the CISCO 
> sends a re-INVITE with the T.38 SDP. Asterisk accepts this re-INVITE. 
> But finally the fax transmission fails and the asterisk verbose trace is:
> 
> *CLI>     -- Attempting call on SIP/080913216002 at outbound-calls for 
> 22222 at fax-out:1 (Retry 1)
>   == Using SIP RTP CoS mark 5
>   == Using UDPTL CoS mark 5
>        > Channel SIP/outbound-calls-0822aae8 was answered.
>   == Starting SIP/outbound-calls-0822aae8 at fax-out,22222,1 failed so 
> falling back to exten 's'
>     -- Executing [s at fax-out:1] Set("SIP/outbound-calls-0822aae8", 
> "FAXFILE=/root/santi/fax/prueba.tif") in new stack
>     -- Executing [s at fax-out:2] 
> SIPDtmfMode("SIP/outbound-calls-0822aae8", "inband") in new stack
>     -- Executing [s at fax-out:3] SendFAX("SIP/outbound-calls-0822aae8", 
> "/root/santi/fax/prueba.tif") in new stack
> [Mar 10 17:15:28] WARNING[17125]: app_fax.c:176 phase_e_handler: Error 
> transmitting fax. result=11: Far end cannot receive at the resolution of 
> the image.
> [Mar 10 17:15:28] WARNING[17125]: app_fax.c:621 transmit: Transmission error
>   == Spawn extension (fax-out, s, 3) exited non-zero on 
> 'SIP/outbound-calls-0822aae8'
> 
> Any ideas?
> 
> Thanks. Best regards,
> 
> Santi
> 
> 
> 
> On Tue, Mar 10, 2009 at 4:26 PM, Joshua Colp <jcolp at digium.com 
> <mailto:jcolp at digium.com>> wrote:
>  >
>  > ----- "Santiago Gimeno" <santiago.gimeno at gmail.com 
> <mailto:santiago.gimeno at gmail.com>> wrote:
>  >
>  > >
>  > > **The call-file I'm using is:
>  > >
>  > > Channel: SIP/080999999999 at outbound-
>  > > calls
>  > > MaxRetries: 3
>  > > WaitTime: 30
>  > > Set: LOCALSTATIONID=22222
>  > > Set: LOCALHEADERINFO=T38 fax
>  > > Set: T38CALL=1
>  > > Set: T38TXDETECT=yes
>  > > CallerID: 22222
>  > > Context: fax-out
>  > > Extension: 22222
>  > > priority:1
>  > >
>  >
>  > And upon further examination... don't put T38CALL in as a variable. 
> It will cause the initial INVITE to only
>  > have T38. Leave it out and things should hopefully reinvite.
>  >
>  > --
>  > Joshua Colp
>  > Digium, Inc. | Software Developer
>  > 445 Jan Davis Drive NW - Huntsville, AL 35806 - USA
>  > Check us out at:  www.digium.com <http://www.digium.com>  & 
> www.asterisk.org <http://www.asterisk.org>
>  >
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