Go for dependencies...

aptitude install build-essential libcurl3-dev libvorbis-dev libspeex-dev unixodbc unixodbc-dev libiksemel-dev flex xsltproc
aptitude install linux-headers-`uname -r` g++ libncurses5-dev libnewt-dev libusb-dev subversion git-core

Downloading and untarring...

cd /usr/src
wget http://downloads.digium.com/pub/asterisk/asterisk-1.4-current.tar.gz
wget http://downloads.digium.com/pub/zaptel/zaptel-1.4-current.tar.gz
wget http://downloads.digium.com/pub/libpri/libpri-1.4-current.tar.gz
wget http://www.misdn.org/downloads/mISDN.tar.gz
wget http://www.misdn.org/downloads/mISDNuser.tar.gz
wget http://downloads.digium.com/pub/asterisk/asterisk-addons-1.4-current.tar.gz
tar xvzf asterisk-1.4-current.tar.gz && tar xvzf zaptel-1.4-current.tar.gz && tar xvzf libpri-1.4-current.tar.gz && tar xvzf mISDN.tar.gz && tar xvzf mISDNuser.tar.gz && tar xvzf asterisk-addons-1.4-current.tar.gz

Installing Zaptel

cd /usr/src/zaptel-1.4*
./install_prereq test
./install_prereq install
./configure
make
make install
make config
modprobe ztdummy

Installing Libpri

cd /usr/src/libpri-1.4*
make && make install

Installing mISDN

Note: Don't compile the current version (1.1.7) with the last kernel (2.6.23.12). The (2.6.18.10) was tested and works.

cd /usr/src
git-clone git://git.misdn.org/git/mISDN.git/
git-clone git://git.misdn.org/git/mISDNuser.git/
cd /usr/src/mISDN
make
make install
cd /usr/src/mISDNuser/
make && make install

Configuring...

mISDN scan
mISDN config

This creates the file /etc/mISDN.conf which you should review and/or edit.

vi /etc/mISDN.conf

If everything looks good, we're going to start mISDN.

mISDN start

Check that everything is right,

misdnportinfo

Create the system startup links for mISDN:

/usr/sbin/update-rc.d mISDN defaults 15 30