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       tsi - Transmission Subscriber Identification (TSI) access control list


       The HylaFAX configuration parameter QualifyTSI specifies whether or not
       the identity of a calling facsimile machine should be  checked  against
       an  access  control  list before receiving facsimile.  If QualifyTSI is
       non-null, then only messages from facsimile machines identified in  the
       file specified by the string (typically etc/tsi) will be accepted.

       Patterns  are  specified  one  per line and must conform to the regular
       expressions  syntax  specified  by  POSIX  1003.2;  see   re_format(7).
       Comments  may be included; they are introduced with the ``#'' character
       and extend to the end of the line.  Any trailing white space on a  line
       is ignored (for convenience when comments are used).

       If  a  line  begins  with ``!'', then the regular expression identifies
       clients that should be rejected; otherwise regular expressions identify
       clients  whose transmissions should be accepted.  The order of patterns
       in a TSI file is important.  When a facsimile is to  be  received,  the
       fax  server  will  compare the client's TSI against the patterns in the
       access control list in the order in which they appear in the file.  The
       first  pattern that matches the client TSI is used to decide whether to
       accept or reject the facsimile.  If no patterns match  the  client  TSI
       then  the  facsimile is rejected.  Thus if you want to accept all but a
       restricted set of TSI the last line in the file should be ``^.*$''.

       Note that regular expression patterns should be written to match a  TSI
       exactly.  That is, patterns should be of the form:

       where  the ``^'' and ``$'' characters are used to specify the start and
       end of the matching TSI.   Additionally,  regular  expression  patterns
       should  handle  white  space  that  may appear in known locations.  For
            ^([+]1){1}[ .-]*415[ .-]*555[ .-]*1212.*$

       matches the following TSI strings:
                  415  555  1212

       Finally, note that regular expressions can be used to specify many  TSI
       with one pattern.


       It  would be nice if TSI that were to be matched against were placed in
       some canonical form (e.g.  remove  white  space  and  white  space-like
       characters).   This  is,  however,  problematic, because some facsimile
       machines permit any printable ASCII string to be sent as a TSI.


       faxgetty(8), re_format(7), hylafax-config(5)

                               December 5, 1994