Cisoc 7960 (chan_sccp) -> extensions are busy, ringing or

Hallo,

we use the CISCO 7960 with chan_sccp. How can I see on the phone display what extensions are busy, ringing or available?

How can I see on the phone which extension was orignally called?
Example:
External caller (026262626) call our number 026 / 26 26 26 - 312

At the moment i see only 02626262626. I want see:
312 -> 02626262626

How?

Michael