Hi Patricio,
You can set up an individual Authorization Code for individuals (FAC) that prevents Toll calls unless the PIN is entered. This sounds like it may be what you need. Have a look;
You can use FAC for colleges, universities, or any business or organization when limiting access to specific classes of calls proves beneficial. Likewise, when you assign unique authorization codes, you can determine which users placed calls. For each user, you specify an authorization code, then enable FAC for relevant route patterns by selecting the appropriate check box and specifying the minimum authorization level for calls through that route pattern. After you update the route patterns in Cisco CallManager Administration, update your dial plan documents to define the FAC-enabled route patterns and configured authorization level.
http://www.cisco.com/en/US/products/sw/voicesw/ps556/products_administration_guide_chapter09186a00803f3af7.html#wp1052254
Adding Forced Authorization Codes
After you design your FAC implementation, you enter authorization codes either in Cisco CallManager Administration or through the Cisco Bulk Administration Tool (BAT). Consider using BAT for large batches of authorization codes; the comma separated values (CSV) file in BAT serves as a blueprint for authorization codes, corresponding names, and corresponding levels. For future reference, make sure that you update your dial plan documents or keep a printout of the CSV file with your dial plan documents.
To add a small number of authorization codes in Cisco CallManager Administration, perform the following steps:
Procedure
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Step 1 In Cisco CallManager Administration, choose Feature > Forced Authorization Code.
Step 2 In the upper, right corner of the window, click the link, Add a New Forced Authorization Code.
Step 3 Configure the authorization codes by using the configuration settings.
Step 4 Click Insert.
Step 5 Repeat Step 2 through Step 4 to add all authorization codes.
Step 6 After you add all authorization codes, see the "Enabling Forced Authorization Codes for Route Patterns" section.
From this doc;
http://www.cisco.com/en/US/products/sw/voicesw/ps556/products_administration_guide_chapter09186a00803f3af7.html#wp1045196
Hope this helps!
Rob
