Interconnect restriction trough Sip trunk (Mitel 3300)

Hi all!

Anyone knows how can I set the Interconnect restrictions and Intercept handling?

I wanna restrict the incoming calls trough SIP Trunk but only for a few extensions.

Example:

call ----> SIP trunk ----> IVR (...if you know the extension number, please dial it now...) ----> 300 ----> OK (300 is a valid option)

call ----> SIP trunk ----> IVR (...if you know the extension number, please dial it now...) ----> 200 ----> WRONG! (200 is not a valid option, so the prompt sounds again..)

Am I clear?

This is what I did:

I defined 3 InterCOs:
InterCO Availabled Phones: 1
InterCO Restricted Phones: 2
InterCO Sip Trunk: 3

I defined the InterCOs rules(Interconnect Number):
From Interconnect Number --------- To Interconnect Number
1 - clear
2 - clear
3 - 2

So, I set up a dummy extension with his own VM. The extension is always forwarded to his VM.

Then, I defined the InterCEs (Intercept Handling)
Intercept Number
3 - All the options -> The dummy extension

Is this ok? because is not working, this doesn't restrict nothing.

thanks all in advance