Moony is a useful and reliable ISDN call monitor program. The basic purpose is to show the phone number (and names) for incoming calls.
Other highlights are telephone answering machine, fax (send and receive), SMS notification and network support.
The display of calls is done in a call history window and in a small popup window which is shown while the call comes in. Moony supports multiple phone numbers (MSNs), lists of known callers (to show the name instead of the phone numbers), area code support (e.g. telling you where a caller comes from).