.TP 5
.BI writeconf " file"
Writes the configuration into a file. If
.I file
is omitted, the default file
.B /etc/isdn/isdn.conf
will be used.
.TP 5
.BI readconf " file"
Reads the configuration from a file. If
.I file
is omitted, the default file
.B /etc/isdn/isdn.conf
will be used.

.SS Syntax of the configuration file
This syntax will be used for the options
.B readconf
and
.B writeconf.

All entries are included in the section
.B [ISDNCTRL].
This section contains an entry
.B INTERFACES,
which describes the interfaces. Each subsection 
.BR [INTERFACE] " or " [SLAVE]
describes one interface. There are the following entries possible:
.TP 5
.BI "NAME = " name
The name of the interface.
This entry is required.

.B Example:
NAME = ippp0
.TP 5
.BI "EAZ = " eaz
Set the EAZ or the MSN.
This entry is required.

.B Example:
EAZ = 4711
.TP 5
.BI "PHONE_IN = " num " [" num ...]
Set the incoming phone number(s).
It requires at least one blank between the different numbers.

.B Example:
PHONE_IN = 08151234 08151235 08151236
.TP 5
.BI "PHONE_OUT = " num " [" num ...]
Set the outgoing phone number(s). 
It requires at least one blank between the different numbers.

.B Example:
PHONE_OUT = 08151237 08151238
.TP 5
.B SECURE = on|off
Turn on or off the security feature.

.B Example:
SECURE = on
.TP 5
.B CALLBACK = off|in|out
Selects callback mode.

.B Example:
CALLBACK = in
.TP 5
.B CBHUP = on|off
Turns on or off hangup before starting callback.

.B Example:
CBHUP = on
.TP 5
.BI "CBDELAY = " seconds
Set the callback delay to
.IR seconds .

.B Example:
CBDELAY = 5
.TP 5
.BI "DIALMAX = " num
Set the number of dial atempts to
.IR num .

.B Example:
DIALMAX = 1
.TP 5
.BI "HUPTIMEOUT = " seconds
Set the hanguptime to
.IR seconds .

.B Example:
HUPTIMEOUT = 20
.TP 5
.B IHUP = on|off
Turns on or off the hangup timeout for incoming calls.

.B Example:
IHUP = on
.TP 5
.B CHARGEHUP = on|off
Turns on or off hangup before next charge info.

.B Example:
CHARGEHUP = on
.TP 5
.BI "CHARGEINT = " seconds
Sets the charge interval to
.IR seconds .

.B Example:
CHARGEINT = 1
.TP 5
.BI "L2_PROT = " protocol
Set the layer-2 protocol.
Allowed values for
.I protocol
.RB are " x75i" , " x75ui" , " x75bui " and " hdlc" .

.B Example:
L2_PROT = hdlc
.TP 5
.BI "L3_PROT = " protocol
Set the layer-3 protocol.
Allowed value for
.I protocol
.RB "is only " trans .

.B Example:
L3_PROT = trans
.TP 5
.BI "ENCAP = " encapsulation
Sets the encapsulation mode.
Allowed values for
.I encapsulation
.RB are " rawip" , " ip" , " cisco_h" , " cisco_hk" , " ethernet" , " syncppp " and " uihdlc" .

.B Example:
ENCAP = rawip
.TP 5
.BI "ADDSLAVE = " slave
Adds a slave interface for channel-bundling.

.B Example:
ADDSLAVE = s-ippp0
.TP 5
.BI "SDELAY = " seconds
Set the delay in seconds for the slave-dialing.

.B Example:
SDELAY = 10
.TP 5
.BI "TRIGGER = " cps
Set trigger level for slave-dialing.

.B Example:
TRIGGER = 4000
.TP 5
.BI "BIND = " driverId , channel
Binds the current interface to a specific physical channel.
Before and after the comma may not be a blank.

.B Example:
BIND = teles1,0
.TP 5
.BI "PPPBIND = " num
Binds the current interface to the ippp device
.BI /dev/ippp X .
This works only for syncronous ppp.
The value must be a number.

.B Example:
PPPBIND = 0

.TP 5
.B Example for a configuration file

[ISDNCTRL]
  INTERFACES = {
    [INTERFACE]
    NAME      = isdn0
    EAZ       = 4711
    PHONE_IN  = 08151234
    PHONE_OUT = 08151234
    SECURE    = on
    DIALMAX   = 1
    HUPTIMEOUT= 20
    IHUP      = on
    CHARGEHUP = on
    L2_PROT   = hdlc
    L3_PROT   = trans
    ENCAP     = rawip
    ADDSLAVE  = s-isdn0
    SDELAY    = 10

    [SLAVE]
    NAME      = s-isdn0
    EAZ       = 4711
    PHONE_OUT = 08151234
    SECURE    = on
    DIALMAX   = 1
    HUPTIMEOUT= 10
    IHUP      = on
    CHARGEHUP = on
    L2_PROT   = hdlc
    L3_PROT   = trans
    ENCAP     = rawip

    [INTERFACE]
    NAME      = ippp0
    EAZ       = 4712
    PHONE_OUT = 08151235 08151236
    SECURE    = on
    DIALMAX   = 5
    HUPTIMEOUT= 200
    IHUP      = on
    CHARGEHUP = on
    L2_PROT   = hdlc
    L3_PROT   = trans
    ENCAP     = syncppp
    PPPBIND   = 0
  }