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Cor-List and Toll fraud

Hi,

I have problems with toll fraud somebody has connected inside with SIP and it makes expensive call outside:

I blocked all ports exept 80 it looks ok now but everyday all lines are block like are busy .

Router IOS is 12.4 i don't have space to upgrade IOS and CUE i'm looking to fix it with this IOS how : ???

Please give me some ideas to prevent this:

Questions :

1. Can we prevent toll fraud with Core list ??

2. Can we do this with voice source group ??

Give me idea to prevent toll fraud .. but with same IOS 12.4

Thanks,

Gezim

1 REPLY
Hall of Fame Super Gold

Cor-List and Toll fraud

Already discussed in another thread

https://supportforums.cisco.com/message/4025431

Please avoid posting duplicates.

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