[asterisk-users] T.38 SIP Issues

[Andreas van dem Helge]

Asterisk receives T.38 RTP packet from one SIP peer and sends it to
the other SIP peer, it does not process the packets.

By your argument I can't do T.38 @ 1440bps unless the manufactures of
the Ethernet cable, switch, router, keystone jacks, network cards,
CPU, RAM, etc all paid for the royalties for the T.38 patent.

It's like G729 pass-thru.... Just the endpoints need to have the codec.



On Fri, Mar 14, 2008 at 7:58 AM, Mindaugas Kezys <mkezys at gmail.com> wrote:
> Hello,
>
>  Higher speeds then 9600kbps are not permited by patents.
>
>
>  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.
>  >
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