[asterisk-users] Fwd: Re: Asterisk T.38 Pass-Through doesn't work

[Kevin Larsen]

The a=T38MaxBitRate issue you refer to was one that was actually 
discovered at my company and submitted by a colleague. It was fixed in 
11.3.0 and 1.8.21.0. However, I think that it wouldn't help based on the 
description below being that the parameter was missing altogether. I think 
if that parameter is missing, then the code would in fact default to 2400 
as a safe value.

Kevin Larsen - Systems Analyst 



From:   Zoltán Fekete <blaxy at gyoz.info>
To:     asterisk-users at lists.digium.com, 
Date:   07/21/2013 04:40 PM
Subject:        [asterisk-users] Fwd: Re: Asterisk T.38 Pass-Through 
doesn't work
Sent by:        asterisk-users-bounces at lists.digium.com




Hi!
I have exactly the same problem on asterisk 1.8.22.0  and also on separate 
11.2.1 when sending fax to PSTN.
Tryed with spa-3102, spa-2102, Patton Smartnode 4634, and Zoiper 
softphone.
SpanDsp also works without any problem on my box.
As I remember it was a bug in 1.8.1.x that the a=T38MaxBitRate paramater 
was sent as "maxBitRate". Without capital "M". 
Are you closer to the solution?
I have tryed almost anything and I don't understand why sends the 
T38MaxBitRate:2400 parameter.
regards,
Blaxy
> On 06/03/2013 05:03 PM, Larry Moore wrote:
> > Have you checked the installed version of firmware against the latest 
> > available from Cisco?
> Oh! I didn't guess to check. The firmware was not fresh, but upgrading 
> doesn't help.
> > Looking at your SIP information when your ITSP initiated a T.38 
> > session it did not indicate a maxmimum bitrate, it would appear your 
> > spa112 attempted to negotiate a connection at 2400bps.
> Whether there is a way to force my provider to indicate maximum bitrate?
> > Do you have a sip debug session when you sent a fax from your Asterisk 

> > box to the PSTN, it would be interesting to see if it sends it as a 
> > t.38 or reverts to G711 audio.
> I have collect a set of debugs (with fresh SPA112 firmware) and actual 
> config files:
>
> == spa112 — cmd ReceiveFax
> https://gist.github.com/anonymous/5701032
>
> == cmd SendFax — PSTN
> https://gist.github.com/anonymous/5701150
>
> == spa112 — PSTN
> https://gist.github.com/anonymous/5701207
>
> == sip.conf
> https://gist.github.com/anonymous/5701231
>
> == udptl.conf
> https://gist.github.com/anonymous/5701247
>
>

______________________________________________________________________
This email has been scanned by the Symantec Email Security.cloud service.
For more information please visit http://www.symanteccloud.com
______________________________________________________________________--
_____________________________________________________________________
-- Bandwidth and Colocation Provided by http://www.api-digital.com --
New to Asterisk? Join us for a live introductory webinar every Thurs:
               http://www.asterisk.org/hello

asterisk-users mailing list
To UNSUBSCRIBE or update options visit:
   http://lists.digium.com/mailman/listinfo/asterisk-users

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.digium.com/pipermail/asterisk-users/attachments/20130722/3800d033/attachment.htm>