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TSI(5F)							  TSI(5F)

NAME
       tsi  - Transmission Subscriber Identification (TSI) access
       control list

DESCRIPTION
       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 reg-
       ular  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:
	    ^<pattern>$

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

       matches the following TSI strings:
	      +1.415.555.1212
		  415  555  1212
	      1-415-555-1212

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

			 December 5, 1994			1

TSI(5F)							  TSI(5F)

NOTES
       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.

SEE ALSO
       faxgetty(8C), re_format(7), config(5F)

			 December 5, 1994			2

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