I found this interesting insofar as it is somewhat rare for endpoint CPEs to have these features baked in, in particular with any sort of CALEA semantics. This is almost always a burden pushed on the transitory service providers upstream from the device. Network device OEMs, in my experience running an ISP (in addition to both making routers and white-labeling them for our service), have never been held to the CALEA requirements historically.
The wikipedia article you shared actually states this pretty clearly as well:
>" The IP-based "soft switches" typically do not contain a built-in CALEA intercept feature; and other IP-transport elements (routers, switches, access multiplexers) almost always delegate the CALEA function to elements dedicated to inspecting and intercepting traffic. In such cases, hardware taps or switch/router mirror-ports are employed to deliver copies of all of a network's data to dedicated IP probes."
(I realize that Microtik's RouterOS may end up on headend router devices and that is likely why this exists, but the implementation details here are just a little odd when you can just port mirror on a switch instead)