Indentify incomming lines

[Powermage]

At our company we have about 10 numbers in use, every number is having it's own sip account for in and outgoing calls. when we are getting incomming calls our Snom320 phones show the Caller ID, but we also want to see the incomming line (number) that is used, because of the different departments/names that are used. when i program DID numbers i can force to override the caller ID but then the only thing i see is the name and not the number. (still the 3cx client is showing the number not the DID name.) how do you guys solve this?