| 摘要 |
A system for providing a Voice over Internet Protocol (VoIP) service has an Internet Protocol (IP) address detector for detecting an IP address assigned to a customer by an IP network during a VoIP communication session with the customer. An IP address database stores detected IP addresses. The IP address detector is configured for detecting a first IP address assigned to a customer during a first VoIP communication session with the customer, and for detecting a second IP address assigned to the customer during a second VoIP communication session with the customer. The second IP address is compared with the first IP address to produce an address change signal indicating a change in a physical location of the customer when the second IP address does not correspond to the first IP address.
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