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VCS Expressway Toll Fraud

Hi all,

Today, I found a security hole in my MSE 8321 ISDN GW when the calls are from VCS Expressway.

VCSe and VCSc version X7.2.2 and MSE 8321 ISDN Gw 2.2(1.79)P

I had created some Serach Rules to block the calls from VCS Expressway to ISDN GW with the prefix or regex expression of my ISDN GW.

The issue is that:

If a call enter to my VCSe with for example: PrefixIDSNXXXXX#, the call is routed to my VCS Control and to the ISDN GW and the call is stablished.

I have to create a Search Rule to prevent this calls, you can check the attached file.

With this Searh Rule I got block this calls.


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VIP Green

VCS Expressway Toll Fraud

While not technically a security hole, or a problem with the hardware/software, it's more of a configuration issue.  As mentioned in other forum threads on ISDN Toll Fraud, there are different ways of preventing this, and a single rule is not always enough to fully prevent these types of issues.  The solution you have provided may work in your environment, but will not in many others.  For some good examples of how to do it, see Paulo's posts in this ISDN thread.



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