In this user guide, we describe some of the possible causes that can cause the freeswitch t 38 codec to work, and then I provide some possible solutions that you can try to solve for this problem.

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    RelativesFreeSWITCH™ modules, including mod_fax, mod_t38gateway, not to mention mod_voipcodecs, have long been bundled into a single module, often mod_spandsp code> which uses all the DSP features contained in this Spandsp library, including the T.38 endpoint and pass-through features. East

    mod_spandsp is included by default in modules.conf and is therefore compiled automatically. It is also included by default in modules in.conf.xml


    Make sure the development libtiff downloads are properly installed. Discover the dependencies on our own installation pages.

    If you’re having problems with the TIFF library, try this:

    * Compilation errors/problems
    If you get “/usr/bin/ld: environ cannot find -ljpeg” (FreeBSD) or something similar, check it by to see If you have installed a certain TIFF library, see above how to install it for your operating system.


    It is important to create an XML configuration file, as this is where you can set up your fax queue home directory.

    * Trigger an Out event for eachth received/sent fax.
    * Trigger an Out event for each received/sent fax.

    In addition, mod_spandsp requires that you use the G.711 (PCMA/PCMU) codec to send T.30 faxes, otherwise it will not work. If you need to use txfax for sending in addition to rxfax for receiving, be sure to use the same codec on both ends.

    Invoking An Application From An XML Dial Plan

    You can call the rxfax application and/or use the data to complete the TIFF file name. If you don’t pass
    data option information, mod_spandsp writes the filename along with the location of the received fax to a separate spool directory for you.

    To Receive Faxes

    If your website wants each fax to have a unique name, you can use the above option:

    If you want mod_spandsp to resend an INVITE for T.38 (according to the standard, no doubt), use this:

    To Send A Fax

    PDF file can be converted to TIFF using ImageMagick, here is a great example:

    You can use Ghostscript for PDF/PS files. Hereexample of creating a standard resolution TIFF file:

    Using -g1728x1078 and -g1728x2156 ensures that most of the resulting TIFF files will contain web pages that are compatible with facsimile devices. If the PDF file contains binary images instead of scalable elements, the images displayed in the resulting TIFF catalog may not match the pages.

    Manual Broadcast

    If you’re faxing, bind_meta_app will come in handy as the live operator will send the fax signal to your family.

    Run Mainly Based On The Results Of The Fax Session

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  • Channel variables that allow you to take action based on the success or failure of all fax transmissions.

    freeswitch t 38 codec

    Variables: find execute_on_fax_success, execute_on_fax_result, execute_on_fax_failed, execute_on_fax_detect. Be sure to add an application call. Run

    before rxfax

    Example: Lua script when mod_spandsp reports a successful transfer.

    Example: executing a payment command when mod_spandsp reports a translation error.

    Invoking An Application From The Command Line Interface

    To send a fax

    The CLI uses Fax Gateway and machine number 100 to send a fax profile from an external device. They need help using it.

    To send a fax over a secure SIP T.38 source from ulaw

  • Make sure you have at least a lot of FreeSWITCH git dates after May 25, 2010.
  • Additionally, mod_spandsp.Param needs to be loaded
  • add enable-t38 to true in conf/autoload_configs/spandsp.conf.xml.Older
  • Note: FreeSWITCH changes used the fax.conf.xml file instead. Newer versions only use fax.conf. If it’s xml they don’t find spandsp.conf.xml.
  • Immediately before deploying the bridge, run: t38_gateway with a factor equal to “self”. It monitors the new signal generated by the fax, so you can easily switch to T.38 if needed.
  • I rated the SPA3102, Linksys. They must be in T.38 mode to be re-invited.

    fax2mail: send a fax often after receiving it in email

    freeswitch t 38 codec

    In new versions connected to FreeSWITCH, the numbering plan ends when rxfax completes, in which case api_hangup_hook runs the script. It is important that api_hangup_hook forward rxfax be defined in the numbering plan. If you are accessing the fax variable for the script body, you must
    escape it (example: $fax_image_size)

    This dial plan also includes some possible regular expressions for some UAs that only have dedicated faxes connected to, so that they send an attachment to the Internet fax service as a fax.

    * The Uuencode no format is no longer supported or as good as MIME. Using Mutt, which sends attachments, still solves this problem, but creates some difficulty in setting up the email structure. This solution provides a way to handle any such case. Edit paths and spaces match your fax service. Create a file $base_dir/scripts/ like this:

    * Now create a muttrc. This option allows you to send emailOther emails bypassing a local mailbox, which a person running FreeSWITCH is unlikely to have (you can add additional settings to the email headers according to your needs):

    Here is another example, a continuous Python script called [] using XML:< /p >

    This numbering plan python script follows the mod_python path of your FreeSWITCH, but runs mod_spandsp to receive a new fax, then converts it to PDF and emails it. The script requires that you have installed the ps2pdf utility (from Ghostscript) in addition to tiff2ps. FreeBSD is everywhere in these ports, and is also available on most Linux distributions via package therapy (apt-get, yum, rpm, etc.). This Python script also requires the actual installation of mod_python and mod_spandsp. More info [ here].

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