faked caller number?

[Christoph Kukulies]

I'm wondering why my outgoing ISDN number is causing incoming
calls on another ISDN phonenumber while I definitely
know that I'm not calling this number (since I don't know that number at all).

The owner of that number came to me and asked me why I was calling him.
I wondered.

Is there a way to fake the outgoing caller phone number (with i4B) or some
other ISDN software? 

--
Chris Christoph P. U. Kukulies kuku_at_kukulies.org