Re: [Opalvoip-user] T.30 error 49 - spandsp

[Aron W. <aro...@gm...>]

T.38 standard says the callee has to send a reinvite to T.38. In your case I think it's the PSTN.

If the callee does not support T.38, the reinvite is missing and the fax is sent via G711 audio. 

In that case, opal does incorrectly reports a failed fax transmission, but the fax was still transmitted correctly.

I think it's a bug in opal.


On 15.06.2011, at 12:43, Mahudeswaran wrote:

> Remote party?? You mean the Gateway-1 or fax device.
> I think in your case the fax was not received at the fax device end. Is it correct?
>  
> And sometimes I observe like the fax sent successfully - success, 0 of 1 pages
>  
> Points for clarification,
> 1.       Fax sent successfully but T.30 error 49
> 2.       Fax sent successfully but success, 0 of 1 pages
>  
> With the above two points, how to conclude whether a fax sent successfully or not?
>  
> Regards
> mahudeswaran
> From: Aron Wieck [mailto:aro...@gm...] 
> Sent: Wednesday, June 15, 2011 3:51 PM
> To: Mahudeswaran
> Cc: opa...@li...
> Subject: Re: [Opalvoip-user] T.30 error 49 - spandsp
>  
> I have the same behavior if the remote party does not switch to T.38.
>  
> On 15.06.2011, at 12:17, Mahudeswaran wrote:
> 
> 
> Hi,
>  
> I am testing with FaxOPAL sample to send T.38 fax.
> Sometimes the fax sent successfully but the spandsp receives T.30 error 49 (The call dropped prematurely).
>  
> Any reason why this behavior.
>  
> Fax call flow:
> FaxOPAL------>--Gateway-1----------PSTN cloud----------Gateway-2------------fax device
>  
> Faxopal log:
>   1:08.515                    Media Patch:3316     spandsp_fax.cpp(1041)                FaxCodec            Ccfe7a9cc1_1 TIFF_T38::Terminate
>   1:08.515                    Media Patch:3316     spandsp_fax.cpp(800)  FaxCodec            Ccfe7a9cc1_1 SpanDSP entered Phase E:
> Status=49 (The call dropped prematurely)
> Bit Rate=9600
> Encoding=1 T.4 1d
> Error Correction=0
> Tx Pages=0
> Rx Pages=-1
> Total Pages=1
> Image Bytes=49939
> Resolution=8031x7700
> Page Size=1728x1960
> Bad Rows=0
> Most Bad Rows=0
> Correction Retries=0
>  
> Regards
> Mahudeswaran
>  
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