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printer-version

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Believe me it is much easier. The isdn4linux's programmers have already thought at this possibility and you do not need much program knowledge to get something like that.
 

My PC shows me the message with a JPEG-picture, which should not be very big to be loaded very fast later. (about 512x246,  6 KB)

You produce a picture like the one above for every caller you want. It is also possible to scan a photo and use this one instead.
Save the pictures in the directory /etc/isdn/jpeg. If you have to create this directory type

>> mkdir /etc/isdn/jpeg

Next isdn4linux has to learn which picture belongs to which telephone number. This happens in the file /etc/isdn/callerid.conf  .

There should be an entry like 

[MSN] 
NUMBER = 5551234 
ALIAS  = me 
ZONE   = 1 

Every telephone number gets an alias.  ZONE describes to which fare zone the caller belongs to. (You have to enter the telephone number without the area code.)

E.g. you have a friend called Thorsten S. who calls you very often. First you create a JPEG-picture for this caller (see above) and save this in /etc/isdn/jpeg/ with the filename callThorstenS.jpg .

Next enter his data in the file /etc/isdn/callerid.conf . This should look like:

[MSN]
NUMBER = 555333 
ALIAS  = ThorstenS 
ZONE   = 1 
START  = { 
          [FLAG] 
           FLAGS = I|R 
           PROGRAM=/usr/X11R6/bin/xli -fit \ 
/etc/isdn/jpeg/callThorstenS.jpg\ 
- geometry 512x256-350+250 -display :0 & 
}

The new and important thing stands right behind the variable START. There you write what should happen if this numbers calls.
FLAG should not be very interesting for you right now. Instead we concentrate on PROGRAM. 

We use the program xli to show the picture (should come with every linux distribution). Also you could use xv or other programs. I prefer xli because it is small and loads the pictures quite fast.
The option -fit makes it possible that the picture will be presented correctly even on an 8 bit X-server. The second path includes the picture file which will be loaded.
-geometry 512x256-350+250 fixes the size and the position on the windowmanager (you should fit these parameters to your resolution).
-display :0 tells xli on which display the picture should be shown.
You have to enter these lines for every opinion in the file. With copy an paste this should not take a long time.
Now everything should function perfectly. You only have to restart the ISDN driver so it rereads the new callerid.conf.
 

It gets on my nerves that the picture is loaded with a window frame always. It does not look like a message it looks more like a picture - may be because it is one ;-) .
To change this you have to announce the properties of the windows in a different way.

Add an entry into the file ~/.fvwm2rc  like:

Style "/etc/isdn/jpeg/*" NoTitle, Sticky, StaysOnTop   (all in one line!) 

This entry can be placed everywhere but to keep a better overview put it to the other style entries. This line makes it possible that the loaded pictures do not have a window frame any longer and it is "sticky" that means it appears on every virtual desktop you are moving to and it will be placed over all opened windows (StaysOnTop).

Now you have your own telephone pre-warning device.