TSI(5F)                                                                TSI(5F)

       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(8C), re_format(7), hylafax-config(5F)

                               December 5, 1994                        TSI(5F)