Below is a picture of a 14" on-q legrand enclosure with 2 On-Q modules and a DSL router installed. On the left in a 4 line 12 location phone module with 1 line in and 11 lines out. there is a cable plugged in the line seizure port which runs directly to the phone RJ31X jack for the alarm panel. on the right is a snap in six port patch panel. this 6 port patch panel uses snap in keystone jacks (which are provided with the panel). I left the bottom of the can open for the CATV cables which will be terminated by the CATV vendor. just posting it for reference.

This is an Elk enclosure with On-Q phone module, On-Q six port patch panel, DSL modem, and router. The enclosures from Elk, Leviton, On-Q / Legrand, Suttle and others are all punched out to allow for snap in mounting of modules from Elk, Leviton, On-Q / Legrand, Suttle and more. The modules are for the most part interchangeable in these cans (enclosures).