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

       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)
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