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fax_disable_v17Disable V17 modem that is: use lower speed modems (lower speeds are auto-negotiated with the remote party and cannot be forced. That's a work that the spandsp modem handles on its own.)
fax_enable_t38Enable T.38 on a per call basis
fax_enable_t38_requestSend a T.38-ReINVITE when a fax was detected by tone detection
fax_end_pageA sent or receives document will end at specified page
fax_force_callerForce to act as caller or receiver; Mode: Tx=1 or Rx=0''
fax_identThe FAX identity should be set to the telephone number to be used within the FAX exchange. This will typically appear on an LCD display at the far end. In theory it should be limited to digits, spaces, + and one or two other characters appropriate to telephone numbers. In practice FAX machines are usually happy with any text, up to 20 characters long. This string may also play a part in page headers. To disable this header showing at all, put this to "_undef_" NB the underscores
fax_headerIf fax_header is set to a non-null string, a header line will be inserted at the start of each page, just like a typical FAX machine does. The fax_ident, fax_header and the page number will be used to form the text of this line. If you are forwarding FAXes, you probably don't want to add a header line, as there will already be one that was inserted by the original source. If you are sending a locally generated FAX, you probably do want to add header lines to each page. To disable this header showing at all, put this to "_undef_" NB the underscores
fax_prefixPrefix added to the file name for received faxes.
fax_start_pageA sent document will start at the specified page
fax_use_ecmForces the use of ECM if globally disabled, on a per call basis
fax_v17_disabledSame as fax_disable_v17??? This seems to be for T.30 fax mode
fax_verboseBe verbose when printing logs (per call basis)


Definitions for these are found on the Variables page.