Some telcos do not provide all the caller id fields. Fields other than the NMBR should be optional.

From callattendant forum message:

I'm in the process of getting this package to work in UK using USRobotics 5637 and Raspberry PI A+
So far I have had to add a line 204 to modem.py
call_record['NAME'] = "" because the UK CLI doesn't seem support this field..

From another callattendant forum message:

My test call wasn't displayed because the phone didn't provide the DATE and TIME fields. As a result I've modified modem.py to initialise call_record prior to searching for the data from readline().
now=datetime.now()
call_record['DATE']=now.strftime("%m%d")
call_record['TIME']=now.strftime("%H%M")
call_record['NAME']="Unknown"