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CUBE and SIP Trunk to carrier

Are corporations with SIP trunks putting the CUBE (IP-IP GW) in the DMZ or Inside (firewall)? Is there a SRND or design guide on recommendation for customers on cisco.com in regards to security of the CUBE?

I've seen postings where someone's CUBE or H323 gateway in CME was left exposed to Internet and hacked, allowing someone to hairpin calls out to PSTN.

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