[Motorola] MDC-1200 and CDM1250 radio question?

[Coote, Jay]

Can anyone help?
 
It looks like the CDM1250 radio software only allows a 4-digit number
for MDC-1200 ID or Call Alert.
 
The problem is, I need to put a five- or six-digit number in each
individual radio and then display that same number 
in Cimarron Technologies ANI equipment.  My radio ID numbers need to
match the fleet vehicle numbers.
 
Thanks