There are two levels to braodcasting outbound CLI: the ADC of the individual extn(s), and the ADC of the outbound route(s). Where the route permits extn-level CLI to be sent, the extn settings will override; if the route blocks outbound CLI, extn settings don't matter.
In the extn settings, you need to look at the ADC: bit D4 turns the feature on or off (where ADC=D1D2D3D4D5D6D7D8D9D10D11). D4=0 allows outbound CLI to be sent; D4=1 turns off outbound CLI.
Next check your route programming:
run the following command to look at all route parameters
ROCAP:ROU=ALL;
Check the SERV parameters of your outbound routes. Bit D8 ie the 8th digit along in the SERV) controls the outbound CLI - D8=0 hands control of outbound CLI to the extn, D8=1 blocks all outbound CLI.
If you want to block all outbound CLI, then all you need to do is set D8=1 for all your outbound routes (you can determine what routes are set for outbound calls using RODDP

EST=ALL; as one method)
Hope this helps...
Murphy's Law, variant 315: "A short-cut is the longest distance between 2 points".