[asterisk-users] 1.6, t.38 and zoiper - t38_udptl or t38pt_udptl ?

[Stefan Lekov]

Olivier wrote:
>
>
> 2008/12/3 Olivier <oza-4h07 at myamail.com <mailto:oza-4h07 at myamail.com>>
>
>
>
>     2008/12/3 Steve Underwood <steveu at coppice.org
>     <mailto:steveu at coppice.org>>
>
>         Hi,
>
>         I would be interested in any reports of anyone getting a T.38
>         FAX to
>         send or receive successfully with Zoiper. I've tried to test
>         my T.38
>         implementation against more than one revision of Zoiper, and I
>         yet to
>         see it behave sanely.
>
>
>     I could receive yesterday from Zoiper 2.18 Windows free edition
>     with ReceiveFAX installed with latest Asterisk 1.6.X.
>     Would you like more details ?
>
>
> To be more precise, I only tried once and I wouldn't swear T.38 mode 
> was used (I've checked) : maybe ReceiveFax would allow G711 inbound faxes.
>
>
>
>
>         Steve
>
>
>         Olivier wrote:
>         >
>         >
>         > 2008/12/3 regs at kinetix.gr <mailto:regs at kinetix.gr>
>         <mailto:regs at kinetix.gr <mailto:regs at kinetix.gr>>
>         <regs at kinetix.gr <mailto:regs at kinetix.gr>
>         > <mailto:regs at kinetix.gr <mailto:regs at kinetix.gr>>>
>         >
>         >     I tried sending faxes through Zoiper (Zoiper to Zoiper)
>         last week
>         >     and the program crashed. After an update it stopped
>         crashing but
>         >     still could not send a FAX. I then tried Kapanga (the
>         free version
>         >     has a limited 30
>         >     days FAX sending capability) and it worked. This might be of
>         >     little use
>         >
>         >
>         > No it has much value to me.
>         >
>         > I was already suspicious about Zoiper as I could send fax
>         between
>         > other endpoints.
>         >
>         > Originally, I thought using the same software on both could
>         help to
>         > validate other settings (tuning of sip.conf) but to my
>         surprise I
>         > couldn't find much about Zoiper fax capabilities.
>         > I have the rough feeling Zoiper can't receive fax at the
>         moment or
>         > either, tuning Asterisk to allow that is not simple.
>         > For sending, I won't rate it at the moment.
>         >
>         >
>         >
>         >     to you
>         >     since I used Freeswitch with t38 pass-trhough, but my
>         point is :
>         >     first find a client
>         >     that supports t38 FAX capabilites that work and then try
>         asterisk.
>         >     Our company had success
>         >     sending FAX using t38 through asterisk along time ago so
>         I guess
>         >     you will get there sooner or later.
>         >
>         >     Olivier wrote:
>         >>     Hi,
>         >>
>         >>     1. Has anyone got any success when send a TIFF file
>         form one
>         >>     zoiper softphone to another ?
>         >>     I tried using Zoiper 2.18 free edition in windows but
>         I'm seeing
>         >>     415 Unsupported media replies.
>         >>
>         >>     2. Here
>         (http://www.voipinfo.org/wiki/view/Asterisk+T.38), you
>         >>     can read :
>         >>     "Also, try using:
>         >>
>         >>      t38_udptl=yes
>         >>      t38pt_rtp=no
>         >>      t38pt_tcp=no
>         >>
>         >>     ... in the general section of the sip.conf and under
>         the VoIP
>         >>     provider account as well as the fax account. "
>         >>
>         >>     But above, you can read
>         >>     "[general]
>         >>     t38pt_udptl = yes "
>         >>
>         >>     Has this parameter name changed between 1.4 to 1.6 from
>         t38_udptl
>         >>     to t38pt_udptl ?
>         >>     A asterisk remains silent when I add an unknown parameter
>         >>     "foo=bar", it would perfect if someone could point the
>         right name
>         >>     (t38_udptl or t38pt_udptl).
>         >>
>         >>     Regards
>         >
>
>
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The option is t38pt_udptl = yes, and has to be set in both the global 
part and in the peer. The option was t38pt_udptl in 1.4 and I don't 
think it got changed in 1.6.
Also, you can open a ticket with us (zoiper support) on 
support at zoiper.com <mailto:support at zoiper.com>, and if you provide us 
with some packet captures, we should be able to diagnose the issue
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