Cisco SPA 303: how to display incoming line number?

[SPA 303 User]

Hi,
I use three phone numbers with my router: the first one is my private number, the second number is for fax and the third one is my business number. On the SPA 303, I receive both private and business calls. When I receive an incoming call, I would like to know whether it is a private or business call.

Is it possible to display the number the caller has dialled on the display? 

my telephone company allows me to

[Dan Lukes]

There are three color line keys right to main display. They shows which extension is in use or ringing.

[SPA 303 User · Accepted solution]

I have found out that I have to define thee IP Phones in my router and then to configure them under "EXT 1", "EXT 2" and "EXT 3".