imontty man page

imontty — display status of all ISDN lines


imontty [ phonebook ]


imontty displays the status of all ISDN lines. No options are supported. Read access to /dev/isdninfo is required.

It is possible to supply the name of a phonebook file. The phonebook file has the following format:

   number<tab>name for number

The number must be the first thing on the line (no leading spaces). The name is separated from the number by a tab. Lines beginning with # are ignored, as are empty lines.

The output is similar to this:

ISDN channel status:

Channel                 Usage Type  Number
line0                   Out   Net   0204229700                  
line0                   Off         

Usage is one of Off(line), Out(going), In(coming) or Excl(usive).

Type is one of raw (raw device), Modem (modem/tty emulation), Net (IP interface), Voice (voice call) or Fax (fax transmission).

Number is either the called party's number (outgoing) or the calling party number (incoming).


Volker Götz
manpage adapted from the README by Paul Slootman <>

See Also



2000/03/13 isdn4k-utils-3.27 Linux System Administration