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 spec
ified on the
command line) the runtime configuration for the isdnd(8) IS
DN connection
management daemon which is part of the isdn4bsd package.
The configuration file consists of keywords which start in
column 1 followed 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 con
troller can be
set. In the entry section(s) parameters directly associated
with a single remote connection can be set.
The following keywords are recognized by isdnd:
system This keyword starts the system configuration sec
tion. It must
not have a parameter and may be used only once. The
keyword is
mandatory. The following keywords are valid in the
system configuration section:
acctall If this parameter is set to on, ac
counting 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 de
fault is used.
(optional)
add-prefix If set to on, for incoming numbers,
have a look at
the "type of number" indicator and ad
just the number
as specified by the prefix-national and prefix-international keywords described
later. If
this keyword is omitted, the system de
fault (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
alias database file shared with the is
dntel(8) utility when alias processing is enabled
via the
aliasing keyword. (optional)
beepconnect In full-screen mode, if this parameter
is set to on,
ring the bell when connecting or dis
connecting a
call.
extcallattr If this parameter is set to on, the ex
tended 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 conjunction 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 pro
gram is used to
send mail to an administrator specified
by the keyword 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 en
abled. 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 specification may either be:
the name of a local (UNIX-domain)
socket
this MUST start with a "/", ex
ample:
/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 previously used monitor keyword. The sup
ported access
rights are:
fullcmd
restrictedcmd
channelstate
logevents
callin
callout
prefix-international
In conjunction with the add-prefix
switch (see
above), specify the prefix number
string for incoming numbers with the international num
ber tag. If
aliases are used, they have to be ad
justed accordingly. (optional)
prefix-national
In conjunction with the add-prefix
switch (see
above), specify the prefix number
string for incoming numbers with the national number
tag. If
aliases are used, they have to be ad
justed accordingly. (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 expres
sions are specified, please have a look at re_for
mat(7) and
regex(3). The extended regular expres
sion syntax is
supported here.
Hint: it might be necessary to properly
quote the
expression to avoid improper interpre
tation 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 correspond
ing 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 speci
fied as a
parameter to this keyword. (optional)
rotatesuffix
Specifies a suffix for renaming the
log- and the
accounting-filename. In case rotate
suffix 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 behavior. (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 op
tional; if not
specified the process priority of isdnd
is not
touched in any way. ( See also rt
prio(1)). This
keyword is only available if isdnd.rc
was compiled
with -DUSE_RTPRIO.
useacctfile If this parameter is set to on charging
(if avail
able) and accounting information is
written to the
accounting file. (optional)
controller
This keyword starts the controller configuration
section. It
must not have a parameter and may be used once for
every controller. The keyword is optional. The following
keywords are
valid in a controller configuration section:
protocol This keyword is used to set the D-chan
nel protocol
for the S0-bus a controller is connect
ed to. The
following parameters are currently sup
ported:
dss1 The DSS1 or so-called "Eu
ro-ISDN" D
channel protocol according
to ITU Recommendations 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 con
trollers supported by the iavc driver (AVM B1, T1).
This keyword 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 following 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

to find this program beneath the path
/etc/isdn
which is prepended to the string
specified as a
parameter to this keyword. (option
al)
alert is used to specify a time in seconds
to wait
before accepting a call. This key
word is only
usable for incoming telephone calls
(dialin-reaction = 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 sec
onds.
(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.
Any other value than dov sets the
bearer capability as configured by the b1protocol
keyword (see
above). The currently configurable
values are:
dov This connection is a Dov
(Data over Voice)
connection. The b1protocol
keyword must
be set to hdlc. This feature
is experimental and does work on out
going calls
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 successful
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. (op
tional)
budget-calloutsfile-rotate
If set to on rotate budget-call
outsfile every
night when an attempt is made to up
date the file
on a new day. The statistics for the
previous day
are written to a file with the file
name specified
by budget-calloutsfile to which a hy
phen 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 re
mote 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 spec
ified entry to
be copied from the existing named en
try to the
current one. When using this feature
at least a
new entry specific `name' and `usrde
viceunit'
value should be specified for the
current entry.
connectprog specifies a program run every time
after a connec
tion is established and address nego
tiation is
complete (i.e.: the connection is us
able). Isdnd
expects to find the program below the
path
/etc/isdn which is prepended to the
string specified as a parameter to this keyword.
The programs
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 connection just got up, or "down" if inter
face changed
to down state and addr the address
that got
assigned to the interface as a dot
ted-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 connection 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 re
mote 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 sec
onds) to minimize
the chance of two sites dialing syn
chronously 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 connections 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
specifies a program run every time
after a connection was shut down. 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)
downtries is used to configure the number of
unsuccessful
tries (= retry cycles!) before the
interface is
disabled (for downtime seconds).
(see also the
keyword usedown further up). This
keyword is
optional.
downtime is used to configure the time in sec
onds 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 as
sumes fixed
sized charging units dur
ing the whole
call.
var-unit-size
idle algorithm which as
sumes that the
charging is time based
after the first
units time has expired.
idletime-outgoing
The time in seconds an outgoing con
nection must be
idle before hanging up. An idle
timeout of zero
disables this functionality. (op
tional)
idletime-incoming
The time in seconds an incoming con
nection must be
idle before hanging up. An idle
timeout of zero
disables this functionality. (op
tional)
isdncontroller
The ISDN controller number to be used
for connections 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 re
quest as
preferred (the indicated channel is
preferred)
instead of exclusive (only the indi
cated 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 time
out(9) kernel
subroutine to delay the transmission
of the first
packet after a successful connection
is made by
this value for incoming ISDN connec
tions. The
specification unit is 1/100 second.
A zero (0)
disables this feature and is the de
fault value.
This feature is implemented (and
makes sense only)
for the i4bipr(4) IP over raw HDLC
ISDN driver.
(optional)
isdntxdel-outgoing
A delay value suitable for the time
out(9) kernel
subroutine to delay the transmission
of the first
packet after a successful connection
is made by
this value for outgoing ISDN connec
tions. The
specification unit is 1/100 second.
A zero (0)
disables this feature and is the de
fault 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 re
mote 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 ver
ify that it is
the local site which the remote site
wants to connect 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 verify
ing the destination of incoming calls. When a re
mote 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 con
figuration
entry. Its purpose is to use this
name in the
full-screen display for easy identi
fication of a
link to a remote site and for ac
counting purposes.
(mandatory)
maxconnecttime
Specify a maximum connection time in
seconds. Use
this to define an absolute upper lim
it for a connection on the B-channel to last.
CAUTION: This
feature is used to limit the connec
tion time,
_not_ number of attempts to establish
a connection: when using this please take
care to also
enable the use of budgets to limit
the connection
establish attempts (otherwise the
line will cycle
thru an endless loop of connections
and reconnections which will have an undesired
effect on your
telco bill)!
ppp-auth-paranoid
If set to no, the remote site is not
required to
prove its authentity for connections
that are initiated by the local site. The de
fault 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 rechallenging for chap. The default is
yes, which
causes verification of the remote
site's authentity once in a while.
This keyword is only used if
ppp-expect-auth has
been set to chap for an isp PPP in
terface.
(optional)
ppp-expect-auth
The local site expects the authentity
of the
remote site to be proved by the spec
ified 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 authenti
cate 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 authentica
tion 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 interfaces. (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
been set to pap or chap for an isp
PPP interface.
(optional)
ppp-send-auth The authentication method required by
the remote
site. The currently supported param
eters are:
none The remote site does not ex
pect or support
authentication.
chap The preferred authentication
method, which
does not require a password
to be sent in
the clear.
pap The unprotected authentica
tion method,
which allows anybody watching
the wire to
grab name and password.
This keyword is only used for the isp
PPP interfaces. (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 authentity 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; (typ
ically 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 behav
ior 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 suc
ceeds.
remote-subaddr-dialout
The remote subaddress used when the
local site
dials out. When dialing out to a re
mote site, the
subaddress specified here is put into
the Called
Party Subaddress Information Element.
This keyword is mandatory for the ipr
interfaces.
It may be specified more than once to
linked it to
the remote-phone-dialout numbers un
til one succeeds.
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 autho
rized to connect into the local system. This pa
rameter 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 pa
rameter '*' to
permit anyone dialing in.
remote-subaddr-incoming
The remote subaddress used to verify
an incoming
call. When a remote site dials in,
this subaddress is used to verify that it is
the correct
remote site which is herewith autho
rized to connect into the local system. This pa
rameter 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 pa
rameter '*' to
permit anyone dialing in.
unitlength The length of a charging unit in sec
onds. This is
used in conjunction with the idletime
to decide
when to hang up a connection. (op
tional)
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 speci
fied anywhere.
cmdl Use the unitlength specified
on the com
mand line.
conf Use the unitlength specified
in the con
figuration file with the key
word
unitlength.
rate Use the unitlength from the
ratesfile
specified in the configura
tion 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 ``Ad
vice Of Charge
During the call'' which is a
service provided by the telecommunica
tions (ie phone)
provider, to indicate bill
able units).
usrdevicename Specifies the user-land interface
which is used
for interfacing ISDN B channel data
to the userland. The keyword is mandatory.
This keyword
accepts the following parameters:
ipr This parameter configures a
raw HDLC IP
over ISDN interface.
isp This parameter configures a
synchronous
PPP over ISDN interface.
rbch This specifies a Raw B CHan
nel access
interface.
tel ISDN telephony.
ing configures an ISDN B-channel
to NetGraph
interface.
usrdeviceunit Specifies the unit number for the de
vice which is
specified with usrdevicename.
usedown is used to enable the use of the key
words
downtries and downtime in the entries
section(s).
It is used in the isdnd daemon to dy
namically
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 de
fault.
usesubaddr is used to enable the use of subad
dresses. This
parameter is optional and is set to
off by
default.
valid Note: this feature is considered ex
perimental!
The parameter to this keyword is a
string specifying a time range within which this
entry is valid.
The time specification consists of a
list of weekdays and/or a holiday indicator ( see
also the
holidayfile keyword in the system
section ) separated by commas followed by an op
tional 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, day
time 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 conse
quence only
the keyword idletime-incoming has a function
for incoming
calls.
For incoming calls the line is constantly
monitored, and
in case there was not traffic taking place
for the time
in seconds specified by idletime-incoming
the call is
closed.
Typically, idletime-incoming is used as a
last resort and
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 se
lected unitlength
must be 0 (zero) and
idletime-outgoing
greater zero.
The outgoing traffic is con
stantly monitored, 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 se
lected unitlength
and idletime-outgoing must
be greater
than 0 (zero); earlyhangup
must be >= 0
(zero).
|<unchecked-window>|<check
window>|<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 traffic takes place. In case
there was traffic detected in the check
window, the
same procedure is restarted
at the beginning of the next unit. In
case no traffic 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 se
lected unitlength
and idletime-outgoing must
be greater
than 0 (zero);
This shorthold mode is suit
able when your
calls are billed on the
elapse time of
the call plus a fixed con
nection charge.
For example British Telecom
bill this
way.
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 be
fore the first
units time expires.
During the checked period if
there is no
traffic for idle-time sec
onds 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@scot
tb.demon.co.uk>.
BSD August 11, 2002

BSD

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