Customer has a PRI with 12 channels. When originally setup, ISP said they would be sending four digits. Could not get it to work. Called Cisco Small business support and noticed that they were actually sending 8 digits. Ex phone number is 888-8888. ISP is sending 10108888.
We modified config to get it to work. However, after one month customer received a bill for $2000 for calls to Cuba.Obviously toll fraud.
ISP accused UC540 of not being secure.
My question is this:
Can there Cisco device that is handing off PRI be the weak link in toll fraud since they are sending 1010xxxx?
I will post config if needed, but wanted to see if they could be to blame?