Refer to the exhibit. An engineer must implement toll fraud prevention on a Cisco UCM cluster by allowing only the indicated IP address and protocols through Cisco Unified Border Element. What must be configured?
I'm thinking if you configure a trusted list of IP's you would have to add your ITSP IP as well as your CUCM IP. Otherwise, it would block the ITSP connection. Hence, why I would go with A.
I think should be A, based om following excerpt from a Community post and other documents:
"Any address in the session target will be automatically added, hence you dont need to add them. This will include IP address of your CUCM servers as well as IP address of your ITSP that is configured as a sessison target.
NB: You may need to add other IPs from your ITSP as they usually send requests from multiple IP address. You should just ask them for the subnet of their Signalling IPs and add the whole subnet to be safe"
However, I'm assuming there's a typo in the config for Dial Peer 2, since a call to the ISP should be pointing to 192.168.10.11 and not to 192.168.10.10.
This configuration matches the IP address 192.168.11.11, which aligns with the internal network shown in your diagram (CUCM side). It also permits only SIP and H.323 connections, which is crucial for protecting against toll fraud.
Voice services voip
Allow-connections h323 to sip
Allow-connections sip to h323
Ip address trusted list
Ipv4 192.168.11.11
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