Wiretapping mechanism outlined by Cisco in [RFC 3924](https://tools.ietf.org/html/rfc3924):
> Lawful intercept is the lawfully authorized interception and monitoring of communications of an intercept subject. The term "intercept subject" [...] refers to the subscriber of a telecommunications service whose communications and/or intercept related information (IRI) has been lawfully authorized to be intercepted and delivered to some agency.