CUC 12.5.1 - Toll Fraud Prevention

[Quintin.Mayo]

Hi,

The ISP provider informed us fraud calls were coming from our auto-attendant 800 number.  Is there a way to block international calls in CUC? I found some information informing of the CUC restriction tables but it seems the numbers will have to be blocked individually. Is there a way to block any international call using restriction tables or a better method for doing this?  Any assistance would be greatly appreciated.  Any documentation will definitely be appreciative. 

Thanks

[Roger Kallberg]

If you use SIP integration for your CUC to CM setup you should make sure that the inbound CSS on the SIP trunk in CM does not have visibility of any partition(s) that holds any route information for external facing calls. For a SCCP integration it would also be a CSS that controls what can be reached, but it would be associated with other configuration item in CM. Long story short, you should make sure that you do not have any partitions in the CSS that CUC uses that includes call routing for external calls as that is usually not required.

[Maren Mahoney]

In the following example, Long Distance, International (with a prefix 9) and E164-style dialing are all blocked, as well as 900 numbers.

This will control what Unity Connection can outdial on behalf of users, but it is also important as @Roger Kallberg pointed out, to implement call control on the Inbound CSS, Rerouting CSS, and OutOfDialog Refer CSS on the SIP trunk between CUCM and CUC.

Implementing a Restriction Table to the CUC Class of Service associated with your 800 AutoAttendant will allow you to disallow calls to that number to request transfer to blocked numbers, but still allow your internal users (via a different restriction table) to do things like message notification to whatever numbers you want to allow.

Maren