FreeBSD Man Pages

isdnd.rc(5)

NAME

     isdnd.rc -- isdn4bsd ISDN connection management daemon config file format

DESCRIPTION

     The file /etc/isdn/isdnd.rc contains (if not otherwise specified on the
     command line) the runtime configuration for the isdnd(8) ISDN connection
     management daemon which is part of the isdn4bsd package.

     The configuration file consists of keywords which start in column 1 fol-
     lowed by one or more spaces or tabs, an equal sign, one or more spaces or
     tabs and a keyword dependent parameter value.

     A line beginning with '#' is treated as a comment line.

     For keywords requiring the specification of a boolean value, the truth
     value can be either yes or on while the false value can be either no or
     off.

     The configuration file consists of one system section, one or more
     optional controller sections and one or more entry sections.  In the
     system section parameters regarding the daemon operation or parameters
     not associated with a single remote connection can be set.  In the
     controller section parameters regarding a particular controller can be
     set.  In the entry section(s) parameters directly associated with a sin-
     gle remote connection can be set.

     The following keywords are recognized by isdnd:

     system  This keyword starts the system configuration section.  It must
	     not have a parameter and may be used only once.  The keyword is
	     mandatory.  The following keywords are valid in the system con-
	     figuration section:

	     acctall	  If this parameter is set to on, accounting informa-
			  tion is written even if the local site was not
			  charged or no charging information is available or
			  is not subscribed.  (optional)

	     acctfile	  Specifies the name of the accounting file which is
			  used when the keyword useacctfile (see below) is set
			  to on.  See also system keyword rotatesuffix.  If
			  this keyword is omitted the system default is used.
			  (optional)

	     add-prefix   If set to on, for incoming numbers, have a look at
			  the "type of number" indicator and adjust the number
			  as specified by the prefix-national and
			  prefix-international keywords described later.  If
			  this keyword is omitted, the system default (off) is
			  used.  (optional)

	     aliasing	  If this parameter is set to on, alias processing of
			  telephone-number to name is enabled (see also the
			  aliasfile keyword below).  The default is off.
			  (optional)

	     aliasfile	  Specifies the name of the telephone number-to-name
	     extcallattr  If this parameter is set to on, the extended caller
			  attributes "screening indicator" and "presentation
			  indicator" are written to the log-file.  The default
			  is off.  (optional)

	     holidayfile  Specifies the name of the holiday file containing
			  the dates of holidays.  This file is used in con-
			  junction with the valid keyword to lookup the dates
			  of holidays.	(optional)

	     isdntime	  If this parameter is set to on, date/time informa-
			  tion from the exchange (if provided) is written to
			  the log-file.  The default is off.  (optional)

	     mailer	  This keyword is used to specify the path/name of a
			  mail program which is able to use the "-s" flag to
			  specify a subject on its command line.  In case of a
			  fatal error exit of isdnd.rc this program is used to
			  send mail to an administrator specified by the key-
			  word mailto.	(optional)

	     mailto	  This keyword is used to specify the email address of
			  someone to notify in case of a fatal error exit of
			  isdnd.rc.  (See also keyword mailer).  (optional)

	     monitor-allowed
			  If this parameter is set to on or yes, monitoring
			  via a local or remote machine is enabled.  This
			  parameter is optional and is set to off by default.

	     monitor-port
			  sets the TCP port number for remote monitoring.
			  This integer parameter is optional and is set to
			  port 451 by default.

	     monitor	  This keyword specifies a local socket name or a host
			  or network for remote monitoring.  The monitor spec-
			  ification may either be:

			  the name of a local (UNIX-domain) socket
				  this MUST start with a "/", example:
				  /var/run/isdn-monitor
			  a dotted-quad host specification
				  example: 192.168.1.2
			  a dotted-quad network address with netmask
				  example: 192.168.1.0/24
			  a resolvable host name
				  example: localhost
			  a resolvable network name with netmask
				  example: up-vision-net/24

	     monitor-access
			  This keyword specifies the access rights for a pre-
			  viously used monitor keyword.  The supported access
			  rights are:

			  fullcmd
			  restrictedcmd
			  ing numbers with the international number tag.  If
			  aliases are used, they have to be adjusted accord-
			  ingly.  (optional)

	     prefix-national
			  In conjunction with the add-prefix switch (see
			  above), specify the prefix number string for incom-
			  ing numbers with the national number tag.  If
			  aliases are used, they have to be adjusted accord-
			  ingly.  (optional)

	     ratesfile	  Specifies the name of the ratesfile.	If this key-
			  word is omitted the system default is used.
			  (optional)

	     regexpr	  This keyword is used to specify regular expressions.
			  It can be specified more than once up to a compile
			  time dependent value (currently set to 5 by the
			  MAX_RE definition in the source).

			  All specified regular expressions are compared to
			  the log strings at runtime and if a match is found,
			  a program is run with the log text as a parameter
			  (see also the keyword regprog below).

			  For an explanation how regular expressions are spec-
			  ified, please have a look at re_format(7) and
			  regex(3).  The extended regular expression syntax is
			  supported here.

			  Hint: it might be necessary to properly quote the
			  expression to avoid improper interpretation by the
			  configuration file parser.  (optional)

	     regprog	  This keyword is used to specify the name of a pro-
			  gram which is run in case a corresponding regular
			  expression is matched by a logging string.  Isdnd
			  expects to find the program below the path /etc/isdn
			  which is prepended to the string specified as a
			  parameter to this keyword.  (optional)

	     rotatesuffix
			  Specifies a suffix for renaming the log- and the
			  accounting-filename.	In case rotatesuffix is used
			  and a USR1 signal is sent to isdnd, the log-file and
			  the accounting file is not only closed and reopened
			  but the old log-file is also renamed to the former
			  filename with the rotatesuffix string appended.  If
			  this keyword is omitted, the log-files are just
			  closed and reopened; this is also the default behav-
			  ior.	(optional)

	     rtprio	  Specifies the real-time priority isdnd runs at as an
			  integer value in the range 0...31 with 0 being the
			  highest priority.  This keyword is optional; if not
			  specified the process priority of isdnd is not
			  touched in any way.  ( See also rtprio(1)).  This
			  keyword is only available if isdnd.rc was compiled
	     must not have a parameter and may be used once for every con-
	     troller.  The keyword is optional.  The following keywords are
	     valid in a controller configuration section:

	     protocol	  This keyword is used to set the D-channel protocol
			  for the S0-bus a controller is connected to.	The
			  following parameters are currently supported:

			  dss1	      The DSS1 or so-called "Euro-ISDN" D-
				      channel protocol according to ITU Recom-
				      mendations Q.921 and Q.931.
			  d64s	      An ISDN leased line with a single B-
				      channel (called D64S in Germany).

	     firmware	  This keyword is used like firmware=/path/to/file to
			  download the firmware to active controllers sup-
			  ported by the iavc driver (AVM B1, T1).  This key-
			  word is supported for all controller types, and
			  causes I4B_CTRL_DOWNLOAD ioctl to be invoked with
			  the specified file as an argument.  In systems
			  equipped with both active and passive adapters, and
			  the passive cards being detected first, dummy
			  `controller' entries are required for the passive
			  cards to get the correct firmwares to correct
			  adapters.

     entry   This keyword starts one configuration entry.  It must not have a
	     parameter.  This keyword must be used at least once.  The follow-
	     ing keywords are valid in an entry section:

	     answerprog     This keyword is used to specify the name of a pro-
			    gram which is run in case an incoming telephone
			    connection specified answer in its configuration
			    entry.  The default name is answer.  Isdnd expects
			    to find this program beneath the path /etc/isdn
			    which is prepended to the string specified as a
			    parameter to this keyword.	(optional)

	     alert	    is used to specify a time in seconds to wait
			    before accepting a call.  This keyword is only
			    usable for incoming telephone calls (dialin-reac-
			    tion = answer).  It is used to have a chance to
			    accept an incoming call on the phone before the
			    answering machine starts to run.  The minimum
			    value for the alert parameter is 5 seconds and the
			    maximum parameter allowed is 180 seconds.
			    (optional)

	     b1protocol     The B channel layer 1 protocol used for this con-
			    nection.  The keyword is mandatory.  The currently
			    configurable values are:

			    hdlc    HDLC framing.
			    raw     No framing at all (used for telephony).

	     bcap	    Use a special bearer capability for this connec-
			    tion.  The keyword is optional.

				    only.

	     budget-calloutperiod
			    is used to specify a time period in seconds.
			    Within this period, the number of calls specified
			    by budget-calloutncalls are allowed to succeed,
			    any further attempt to call out will be blocked
			    for the rest of the time left in the time period.
			    (optional)

	     budget-calloutncalls
			    The number of outgoing calls allowed within the
			    time period specified by budget-calloutperiod.
			    (optional)

	     budget-calloutsfile
			    A path/filename to which the number of successfull
			    callouts are written.  The contents of the file is
			    preserved when it exists during startup of isdnd.
			    The format of this file is: start time, last
			    update time, number of calls.  (optional)

	     budget-calloutsfile-rotate
			    If set to on rotate budget-calloutsfile every
			    night when an attempt is made to update the file
			    on a new day.  The statistics for the previous day
			    are witten to a file with the filename specified
			    by budget-calloutsfile to which a hyphen and the
			    new day's (!) day of month number is appended.
			    (optional)

	     budget-callbackperiod

	     budget-callbackncalls

	     budget-callbacksfile

	     budget-calloutsfile-rotate
			    See budget-calloutperiod, budget-calloutncalls,
			    budget-calloutsfile, and
			    budget-calloutsfile-rotate above.  These are used
			    to specify the budgets for calling back a remote
			    site.

	     callbackwait   The time in seconds to wait between hanging up the
			    call from a remote site and calling back the
			    remote site.  (optional)

	     calledbackwait
			    The time in seconds to wait for a remote site
			    calling back the local site after a call from the
			    local site to the remote site has been made.
			    (optional)

	     clone	    This causes the contents of the specified entry to
			    be copied from the existing named entry to the
			    current one.  When using this feature at least a
			    new entry specific `name' and `usrdeviceunit'
			    specified by connect and disconnect will get the
			    following command line arguments: -d (device) -f
			    (flag) [ -a (addr) ] where device is the name of
			    device, e.g. "isp0", flag will be "up" if connec-
			    tion just got up, or "down" if interface changed
			    to down state and addr the address that got
			    assigned to the interface as a dotted-quad ip
			    address (optional, only if it can be figured out
			    by isdnd).	(optional)

	     dialin-reaction
			    Used to specify what to do when an incoming con-
			    nection request is received.  The keyword is
			    mandatory.	The currently supported parameters
			    are:

			    accept	Accept an incoming call.
			    reject	Reject an incoming call.
			    ignore	Ignore an incoming call.
			    answer	Start telephone answering for an
					incoming voice call.
			    callback	When a remote site calls, hang up and
					call back the remote site.

	     dialout-type   This keyword is used to configure what type of
			    dialout mode is used.  The keyword is mandatory.
			    The currently supported parameters are:

			    normal  Normal behavior, call the remote site
				    which is supposed to accept the call.
			    calledback
				    Callback behavior, call the remote side
				    which rejects the call and calls us back.

	     dialrandincr   When dialing or re-dialing and this parameter is
			    set to on, the dial retry time is added with a
			    random value (currently 0...3 seconds) to minimize
			    the chance of two sites dialing synchronously so
			    each gets a busy each time it dials because the
			    other side is also dialing.

	     dialretries    The number of dialing retries before giving up.
			    Setting this to -1 gives an unlimited number of
			    retries!  (optional)

	     direction	    This keyword is used to configure if incoming and
			    outgoing, incoming-only or outgoing only connec-
			    tions are possible.  The keyword is optional, the
			    default is inout.

			    The currently supported parameters are:

			    inout   Normal behavior, connection establishment
				    is possible from remote and local.
			    in	    Only incoming connections are possible.
			    out     Only outgoing connections are possible.

	     disconnectprog
			    disabled (for downtime seconds).  (see also the
			    keyword usedown further up).  This keyword is
			    optional.

	     downtime	    is used to configure the time in seconds an inter-
			    face is disabled after the configured number of
			    downtries.	(see also the keyword usedown further
			    up).  This keyword is optional and is set to 60
			    seconds by default.

	     earlyhangup    A (safety) time in seconds which specifies the
			    time to hang up before an expected next charging
			    unit will occur.  (optional)

	     idle-algorithm-outgoing
			    The algorithm used to determine when to hang up an
			    outgoing call when the line becomes idle.  The
			    current algorithms are:

			    fix-unit-size
					idle algorithm which assumes fixed
					sized charging units during the whole
					call.
			    var-unit-size
					idle algorithm which assumes that the
					charging is time based after the first
					units time has expired.

	     idletime-outgoing
			    The time in seconds an outgoing connection must be
			    idle before hanging up.  An idle timeout of zero
			    disables this functionality.  (optional)

	     idletime-incoming
			    The time in seconds an incoming connection must be
			    idle before hanging up.  An idle timeout of zero
			    disables this functionality.  (optional)

	     isdncontroller
			    The ISDN controller number to be used for connec-
			    tions for this entry.  (mandatory)

	     isdnchannel    The ISDN controller channel number to be used for
			    connections for this entry.  In case a channel is
			    explicitly selected here, the SETUP message will
			    request this channel but mark the request as
			    preferred (the indicated channel is preferred)
			    instead of exclusive (only the indicated channel
			    is acceptable).  Thus the exchange is still free
			    to select another than the requested channel!
			    (mandatory)

	     isdntxdel-incoming
			    A delay value suitable for the timeout(9) kernel
			    subroutine to delay the transmission of the first
			    packet after a successful connection is made by
			    this value for incoming ISDN connections.  The
			    specification unit is 1/100 second.  A zero (0)
			    packet after a successful connection is made by
			    this value for outgoing ISDN connections.  The
			    specification unit is 1/100 second.  A zero (0)
			    disables this feature and is the default value.
			    This feature is implemented (and makes sense only)
			    for the i4bipr(4) IP over raw HDLC ISDN driver.
			    (optional)

	     local-phone-dialout
			    The local telephone number used when the local
			    site dials out.  When dialing out to a remote
			    site, the number specified here is put into the
			    Calling Party Number Information Element.

			    This keyword is mandatory for the ipr user-land
			    interfaces.

	     local-subaddr-dialout
			    The local subaddress used when the local site
			    dials out.	When dialing out to a remote site, the
			    subaddress specified here is put into the Calling
			    Party Subaddress Information Element.

			    This keyword is mandatory for the ipr user-land
			    interfaces.

	     local-phone-incoming
			    The local telephone number used for verifying the
			    destination of incoming calls.  When a remote site
			    dials in, this number is used to verify that it is
			    the local site which the remote site wants to con-
			    nect to.  It is compared with the Called Party
			    Number Information Element got from the telephone
			    exchange.

			    This keyword is mandatory for the ipr interfaces.

	     local-subaddr-incoming
			    The local subaddress used for verifying the desti-
			    nation of incoming calls.  When a remote site
			    dials in, this subaddress is used to verify that
			    it is the local site which the remote site wants
			    to connect to.  It is compared with the Called
			    Party Subaddress Information Element got from the
			    telephone exchange.

			    This keyword is mandatory for the ipr interfaces.

	     name	    Defines a symbolic name for this configuration
			    entry.  Its purpose is to use this name in the
			    full-screen display for easy identification of a
			    link to a remote site and for accounting purposes.
			    (mandatory)

	     maxconnecttime
			    Specify a maximum connection time in seconds.  Use
			    this to define an absolute upper limit for a con-
			    nection on the B-channel to last.  CAUTION: This

	     ppp-auth-paranoid
			    If set to no, the remote site is not required to
			    prove its authentity for connections that are ini-
			    tiated by the local site.  The default is yes and
			    requires the remote site to always authenticate.

			    This keyword is only used if ppp-send-auth has
			    been set to pap or chap for an isp PPP interface.
			    (optional)

	     ppp-auth-rechallenge
			    Set to no, if the other side does not support re-
			    challenging for chap.  The default is yes, which
			    causes verification of the remote site's authen-
			    tity once in a while.

			    This keyword is only used if ppp-expect-auth has
			    been set to chap for an isp PPP interface.
			    (optional)

	     ppp-expect-auth
			    The local site expects the authentity of the
			    remote site to be proved by the specified method.
			    The supported methods are:

			    none    Do not require the other side to authenti-
				    cate.  Typical uses are dial-out to an ISP
				    (many ISPs do not authenticate themselves
				    to clients) or offering anonymous dial-in
				    at the local site.
			    chap    The preferred authentication method, which
				    does not require a password to be sent in
				    the clear.
			    pap     The unprotected authentication method,
				    which allows anybody watching the wire to
				    grab name and password.

			    If ppp-auth-paranoid is set to no (the default is
			    yes) outgoing connections will not require the
			    remote site to authenticate itself.

			    This keyword is only used for the isp PPP inter-
			    faces.  (optional)

	     ppp-expect-name
			    The name that has to be provided by the remote
			    site to prove its authentity.

			    This keyword is only used if ppp-expect-auth has
			    been set to pap or chap for an isp PPP interface.
			    (optional)

	     ppp-expect-password
			    The secret that has to be provided by the remote
			    site to prove its authentity.

			    This keyword is only used if ppp-expect-auth has
			    chap    The preferred authentication method, which
				    does not require a password to be sent in
				    the clear.
			    pap     The unprotected authentication method,
				    which allows anybody watching the wire to
				    grab name and password.

			    This keyword is only used for the isp PPP inter-
			    faces.  (optional)

	     ppp-send-name  The authentication name sent to the remote site.

			    This keyword is only used if ppp-send-auth has
			    been set to pap or chap for an isp PPP interface.
			    (optional)

	     ppp-send-password
			    The secret used to prove the local site's authen-
			    tity to the remote site.

			    This keyword is only used if ppp-send-auth has
			    been set to pap or chap for an isp PPP interface.
			    (optional)

	     ratetype	    The rate entry used from the rates file.
			    (optional)

			    For example, ratetype=0 selects lines beginning
			    "ra0" in /etc/isdn/isdnd.rates; (typically ra0
			    lines are a set of tables for local call rates on
			    different days of the week & times per day).

	     recoverytime   The time in seconds to wait between dial retries.
			    (optional)

	     remdial-handling
			    is used to specify the dialout behavior in case
			    more than one outgoing number is specified.  The
			    currently supported parameters are:

			    first   For every new (non-retry) call setup,
				    start with the first number.
			    last    For every new (non-retry) call setup,
				    start with the last number with which a
				    successful connection was made.
			    next    For every new (non-retry) call setup,
				    start with the next number which follows
				    the last one used.

	     remote-phone-dialout
			    The remote telephone number used when the local
			    site dials out.  When dialing out to a remote
			    site, the number specified here is put into the
			    Called Party Number Information Element.

			    This keyword is mandatory for the ipr interfaces.
			    It may be specified more than once to try to dial
			    to several numbers until one succeeds.
			    It may be specified more than once to linked it to
			    the remote-phone-dialout numbers until one suc-
			    ceeds.

	     remote-phone-incoming
			    The remote telephone number used to verify an
			    incoming call.  When a remote site dials in, this
			    number is used to verify that it is the correct
			    remote site which is herewith authorized to con-
			    nect into the local system.  This parameter is
			    compared against the Calling Party Number
			    Information Element got from the telephone
			    exchange.

			    This keyword is mandatory for the ipr interfaces.

			    This keyword may have a wildcard parameter '*' to
			    permit anyone dialing in.

	     remote-subaddr-incoming
			    The remote subaddress used to verify an incoming
			    call.  When a remote site dials in, this subad-
			    dress is used to verify that it is the correct
			    remote site which is herewith authorized to con-
			    nect into the local system.  This parameter is
			    compared against the Calling Party Subaddress
			    Information Element got from the telephone
			    exchange.

			    This keyword is mandatory for the ipr interfaces.

			    This keyword may have a wildcard parameter '*' to
			    permit anyone dialing in.

	     unitlength     The length of a charging unit in seconds.  This is
			    used in conjunction with the idletime to decide
			    when to hang up a connection.  (optional)

	     unitlengthsrc  This keyword is used to specify from which source
			    isdnd(8) takes the unitlength for short-hold mode.
			    The currently configurable values are:

			    none    Then unitlength is not specified anywhere.
			    cmdl    Use the unitlength specified on the com-
				    mand line.
			    conf    Use the unitlength specified in the con-
				    figuration file with the keyword
				    unitlength.
			    rate    Use the unitlength from the ratesfile
				    specified in the configuration file with
				    the keyword ratetype.
			    aocd    Use a dynamically calculated unitlength in
				    case AOCD is subscribed on the ISDN line.
				    (AOCD is an acronym for ``Advice Of Charge
				    During the call'' which is a service pro-
				    vided by the telecommunications (ie phone)
				    provider, to indicate billable units).

				    PPP over ISDN interface.
			    rbch    This specifies a Raw B CHannel access
				    interface.
			    tel     ISDN telephony.
			    ing     configures an ISDN B-channel to NetGraph
				    interface.

	     usrdeviceunit  Specifies the unit number for the device which is
			    specified with usrdevicename.

	     usedown	    is used to enable the use of the keywords
			    downtries and downtime in the entries section(s).
			    It is used in the isdnd daemon to dynamically
			    enable and disable the IP interfaces to avoid
			    excessive dialing activities in case of transient
			    failures (such as busy lines).  This parameter is
			    optional and is set to off by default.

	     usesubaddr     is used to enable the use of subaddresses.	This
			    parameter is optional and is set to off by
			    default.

	     valid	    Note: this feature is considered experimental!
			    The parameter to this keyword is a string specify-
			    ing a time range within which this entry is valid.
			    The time specification consists of a list of week-
			    days and/or a holiday indicator ( see also the
			    holidayfile keyword in the system section ) sepa-
			    rated by commas followed by an optional daytime
			    range specification in the form hh:mm-hh:mm.  The
			    weekdays are specified as numbers from 0 to 6 and
			    the number 7 for holidays:

			    0	    Sunday
			    1	    Monday
			    2	    Tuesday
			    3	    Wednesday
			    4	    Thursday
			    5	    Friday
			    6	    Saturday
			    7	    a Holiday

			    The following examples describe the "T-ISDN xxl"
			    tariff of the german Telekom:
			    1,2,3,4,5,6,09:00-18:00
				    Monday through Saturday, daytime 9:00 to
				    18:00
			    1,2,3,4,5,6,18:00-9:00
				    Monday through Saturday, nighttime 18:00
				    to 9:00
			    0,7     Sunday and on holidays, all 24 hours

			    The use of this keyword is optional.

IDLETIME CALCULATION AND SHORT-HOLD MODE

     incoming calls  It is assumed that the calling side knows most about
		     charging structures and such and as a consequence only
		     the keyword idletime-incoming has a function for incoming
		     is therefore set much higher than a charging unit time:
		     typical values are one to five minutes.

     outgoing calls  Outgoing call disconnect time can be setup in one of
		     three ways:

		     simple mode     For simple mode, the
				     idle-algorithm-outgoing must be
				     fix-unit-size and the selected unitlength
				     must be 0 (zero) and idletime-outgoing
				     greater zero.

				     The outgoing traffic is constantly moni-
				     tored, and in case there was not traffic
				     taking place for the time in seconds
				     specified by idletime-outgoing the call
				     is closed.

				     Typical values in simple mode are 10 to
				     30 seconds.

		     shorthold mode for fixed unit charging
				     For shorthold mode, the
				     idle-algorithm-outgoing must be
				     fix-unit-size and the selected unitlength
				     and idletime-outgoing must be greater
				     than 0 (zero); earlyhangup must be >= 0
				     (zero).

				     |<unchecked-window>|<checkwindow>|<safetywindow>|
				     |			|	      | 	     |
				     +------------------+-------------+--------------+
				     |			|	      | 	     |
				     |			|<-idle-time->|<earlyhangup->|
				     |<--------------unitlength--------------------->|

				     During the unchecked window which is
				     (unitlength - (idle-time+earlyhangup)) in
				     length, no idle check is done.  After the
				     unchecked window has ended, the line is
				     checked for idle-time length if no traf-
				     fic takes place.  In case there was traf-
				     fic detected in the check-window, the
				     same procedure is restarted at the begin-
				     ning of the next unit.  In case no traf-
				     fic was detected during the check-window,
				     the line is closed at the end of the
				     check window.

				     Notice: unitlength must (!) be greater
				     than the sum of idletime-outgoing and
				     earlyhangup!

		     shorthold mode for variable unit charging
				     For shorthold mode, the
				     idle-algorithm-outgoing must be
				     var-unit-size and the selected unitlength
				     and idletime-outgoing must be greater
				     Each call is divided into two periods,
				     the first is the unchecked period and the
				     second is the checked.  The checked
				     period starts 1 second before the first
				     units time expires.

				     During the checked period if there is no
				     traffic for idle-time seconds the call is
				     disconnected.

				     |<---unchecked------------------>|<------checked------>
				     +------------------+-------------+
				     |			|<-idle-time->|
				     |<--------------unitlength------->|

				     Experience shows that useful values for
				     idle-time are from 15 to 30 seconds.

				     If idle-time is too short an application
				     that is not yet finished with the network
				     will cause a new call to be placed.

FILES

     /etc/isdn/isdnd.rc  The default configuration file for the isdnd ISDN
			 daemon.

SEE ALSO

     regex(3), re_format(7), isdnd(8), isdnmonitor(8)

AUTHORS

     The isdnd(8) daemon and this manual page were written by Hellmuth
     Michaelis <hm@FreeBSD.org>.

     Additions to this manual page by Barry Scott <barry@scottb.demon.co.uk>.

FreeBSD 5.4			August 11, 2002 		   FreeBSD 5.4

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