Erroneous caller information on E911 calls

In a practical but hypothetical environment, I have a very large call center with VoIP applications working in Europe supporting an enterprise in the US (outsourcing). What will prevent an E911 call initiated by one of the call center agents from displaying erroneous caller information to emergency services here in the states?
This will depend on the supplier of the VoIP equipment. With the Zultys approach, the network can be segmented into locations logically by IP address range. When an emergency call is made from a device in a specific IP address range, it is matched to a location. Each location has specific routing rules for emergency calls. For example, if an emergency call is dialed by a call center agent (location = Europe) it could be directed to a local PSTN gateway on the local LAN in Europe. The call would go out to emergency services locally in Europe. The call would never come to the USA.
This was first published in April 2005

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