[asterisk-users] T.38 SIP Issues

[Steve Underwood]

Mindaugas Kezys wrote:
> Hello,
>
> Higher speeds then 9600kbps are not permited by patents.
>   
Would you care to name one that prevents 14,400?
> Regards,
> Mindaugas Kezys
> http://www.kolmisoft.com
> MOR PRO - Advanced Billing Solution 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: Friday, March 14, 2008 3:28 AM
> To: Asterisk Users Mailing List - Non-Commercial Discussion
> Subject: Re: [asterisk-users] T.38 SIP Issues
>
> 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.
>>     
Steve