NCOS - Nortel IP Phones restrict outgoing calls to internal only

[SD8146]

Can anyone please let me know how set up NCOS tables so we can restrict the level of outgoing calls from our IP phones - eg: internal calls only, national calls, calls to international and mobile numbers.
We know where to set the NCOS range on the individual handsets but we're not sure how/where to set up the system-wide levels.

Many thanks.