The
info subdirectory in the (Fx
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
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
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 (Ps transfer protocol
The (Fx 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 successfully.
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 updates.
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''.
NOTES
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.
