If you mean Trunking Tables, I think it needs trunking tables for all trunked systems.
It may be that for P25 systems, the receiver gets the trunking table from the control channel, you don't have to supply it like you do for Motorola systems.
In my installation of Win500, there are trunking tables for all trunked systems, even for P25 systems.
Both previous answers are only partially correct. Depending on the system, you MAY need to set up a table. With the latest firmware (from 2011) upgrade installed some systems will require a table while some won't It's not universal to set up trunking tables, there are too many variables before you have to determine if tables are needed.