[asterisk-users] T.38 SIP Issues

[Andreas van dem Helge]

Has someone submitted a bugreport regarding enabling > 9600kbps fax? I
always wonder why it would never negociate 14400kbps... when it did
work a single page on fine resolution would take 4 minutes.

Thank you very much for that link. I knew there had to be more
possible configurations for T.38. I will give it a try... but I think
I can get away without patching chan_sip.c, no? that just seems to
enable higher bitrates.

And Linksys SPA2102 is one of the exact devices I have in my lab.

On Thu, Mar 13, 2008 at 1:52 PM, Mindaugas Kezys <mkezys at gmail.com> wrote:
> Hello,
>
>  This can help: http://80.86.84.71/kolmiwiki/index.php/Send_Receive_Fax-T38
>
>  Regards,
>  Mindaugas Kezys
>  http://www.kolmisoft.com
>  MOR PRO - Advanced Billing for Asterisk PBX
>
>
>
>
>  -----Original Message-----
>  From: asterisk-users-bounces at lists.digium.com
>  [mailto:asterisk-users-bounces at lists.digium.com] On Behalf Of Andreas van
>  dem Helge
>  Sent: Thursday, March 13, 2008 5:16 AM
>  To: Asterisk Users Mailing List - Non-Commercial Discussion
>  Subject: [asterisk-users] T.38 SIP Issues
>
>  Is there any trick to getting T.38 fax to work with SIP? I had it
>  working and one day with no changes *poof* it stopped working and
>  hasn't worked for months. The only common factor is Asterisk 1.4.x
>  (always try to use the latest version) and NAT.
>
>  I've tried:
>
>  -Linksys ATA
>  -Grandstream ATA
>  -Audicodes ATA
>
>  All do the same thing. Call connects, hear the first 2sec of fax tone
>  and then just silence, but the call usually stays open.
>
>  I've tried two T.38-capable providers.
>
>  I've tried two different routers:
>  -Linksys WRT54GS running DD-WRT (Linux)
>  -Dell Optiplex 170L running PFSense (BSD)
>
>  Different Linux distros on the servers:
>  -SuSE 64bit
>  -RHEL 32bit
>  -SuSE 32bit
>
>  Is there any magic to get this to work? As far as I can tell the only
>  possible config option is "t38pt_udptl = yes" which I have set under
>  [general] & the peer.
>
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