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       info - remote device capability database


       The  info  subdirectory  in the HylaFAX spooling area holds information
       about the capabilities and status of devices  that  have  been  called.
       One  file  exists  for  each device, with the filename created from the
       remote device's fully-qualified phone  number.   Files  have  a  simple
       ASCII format.  Each line is of the form
            [&]tag: value
       where  a  tag  identifies  a capability and a value is either a string,
       number, or boolean value.  An optional ``&'' at the front of  the  line
       indicates that the tag's value is locked down and should not be updated
       by  the  server.   This  facility  is  useful   for   restricting   the
       capabilities used with a particular machine.

       The following items are recorded:
              Tag                   Type       Description
              calledBefore          boolean    device has previously answered at this number
              dialFailures          number     count of consecutive failed dial operations
              hasV34Trouble         boolean    there is difficulty sending to this destination with V.34
              hasV17Trouble         boolean    there is difficulty sending to this destination with V.17
              lastDialFailure       string     reason for last failed dial operation
              lastSendFailure       string     reason for last failed send attempt
              maxPageWidth          number     maximum page width in pixels in normal resolution
              maxPageLength         number     maximum page length in millimeters
              maxSignallingRate     string     maximum signalling rate (bits/sec) to use
              minScanlineTime       string     minimum scanline time
              pagerMaxMsgLength     number     length of longest allowed text message
              pagerPassword         string     password string send to service provider
              pagerSetupCmds        string     commands for setting up modem for a specific service provider
              pagerTTYParity        string     parity & # bits configuration for IXO/TAP communication
              pageSource            string     parameter to tell the paging central who we are
              pagingProtocol        string     protocol (IXO or UCP) for this provider
              remoteCSI             string     remote device Called Subscriber Identification
              remoteNSF             string     remote equipment Non-Standard Facilities information
              remoteDIS             string     remote Digital Identification Signal: capabilities
              sendFailures          number     count of consecutive failed send attempts
              supportsBatching      boolean    accepts batching protocol
              supportsHighRes       boolean    accepts 196 line/inch images (obsolete)
              supportsVRes          number     vertical resolution support bitmask
              supports2DEncoding    boolean    accepts Group 3 2D encoding
              supportsMMR           boolean    accepts Group 4 encoding
              supportsPostScript    boolean    accepts Adobe POSTSCRIPT transfer protocol

       The  HylaFAX  scheduler,  faxq(8),  uses the information stored in this
       directory when deciding if a call should be placed and  when  preparing
       documents  for  transmission.   If  a  remote device's capabilities are
       known,  then  document  preparation  is  constrained  and/or  optimized
       according  to  the  capabilities.   Otherwise,  documents  are prepared
       without regard for the remote device's capabilities and if a capability
       mismatch is encountered the session is terminated and the documents are
       reformatted using the newly discovered capabilities.

       The calledBefore item is used by faxsend to decide whether  or  not  to
       redial  a  phone number when encountering certain errors.  For example,
       if a dialing command results in  a  ``NO  CARRIER''  result,  then  the
       number will not be retried unless the number has previously been dialed

       The minScanlineTime item indicates the minimum scanline time  parameter
       used  for  facsimile  transmissions.   Acceptable  values are: ``0ms'',
       ``5ms'',    ``10ms/5ms'',    ``10ms'',     ``20ms/10ms'',     ``20ms'',
       ``40ms/20ms'', and ``40ms''.  (Values of the form X/Y mean to use X for
       98 lpi images and Y for 196 lpi images.)

       The pagerTTYParity item specifies the communication parameters  to  use
       when  communicating  with  the  IXO/TAP  service  provider.  Acceptable
       values are: ``even'' (7  bits,  even  parity),  ``odd''  (7  bits,  odd
       parity),  and  ``none''  (8  bits, no parity).  If nothing is specified
       then ``even'' is used per the standard.

       The pagerMaxMsgLength, pagerPassword, and pagerTTYParity items  can  be
       setup  according  to the requirements of a pager service provider; they
       typically are locked down so that their  values  are  not  lost  during

       The pagerSetupCmds can be used to define AT commands for setting up the
       modem for a specific  service  provider.   This  value  overwrites  the
       settings defined in hylafax-config(5).

       The  pageSource parameter can be used to tell the paging central who we
       are.  It usually contains a SMS answerable mobile number.  It  is  only
       used  for the UCP part of sendpage(8).  Note:  This parameter should be
       used from user-land sendpage(1) and will be removed later.

       The pagingProtocol defines which protocol, UCP or IXO, should  be  used
       to  send  the  message to the service provider. It defaults to ``ixo'';
       for UCP set ``ucp''.


       faxsend, pagesend, and faxq automatically create and update entries  in
       the info directory, as required.

       The  data  in  this  directory is simply a cache of remote capabilities
       and, except for locked down items, can be safely purged  at  any  time.
       The  faxcron(8)  script,  for  example,  periodically  purges  unlocked
       entries in this directory that have not been accessed in 30 days.

       When the first batching attempt fails then supportsBatching is  set  to
       false.   It  must be manually altered in order to re-enable batching to
       the destination.

       Restricting the capabilities used with a particular machine to a  value
       other  than  those  that  are  mandatory can cause documents to be sent
       outside of an acceptable range for the receiver.


       faxcron(8), faxq(8), faxsend(8), pagesend(8), hylafax-config(5)

                               February 10, 1996