| 摘要 |
By defining a static path through a communications network for a call placed by an IP-based telephonic device, stream of packets representing the call are rendered available for wiretapping on a communications network that includes a first and a second switching/routing element. The static path is defined using Multiprotocol Label Switching (MPLS) and Resource Reservation Protocol (RSVP). The first switching/routing element responds to a call initiation request received from the telephonic device by sending an RSVP PATH message to the second switching/routing element. The first switching/routing element marks packets sent by the telephonic device with an identical MPLS Forwarding Equivalence Class (FEC) label, so that the plurality of packets will traverse a predesignated IP address in the communications path, and so as to allow law enforcement officials to monitor packets originating from an IP-based telephonic device using a monitoring mechanism situated at the predesignated IP address.
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