ICC's Telephone Module with RJ31X Jack is an 8-port bridged telephone solution. The module offers a 110 IDC input for both extensions and phone lines and an expansion jack for additional connectivity. It supports up to 8 telephone outlets for phone, fax, modem devices, and has access for up to 4 incoming phone lines. Features Designed to support up to 4 incoming telephone lines with 8 outputs/extensions per line. Module bridged using only 2 incoming lines can get 16 outputs/extensions per line. 1 incoming line can get 32 outputs/extensions. Includes an RJ31X jack connected to line 1 for a security system. Includes an expansion jack for more outputs/extensions by connecting the 8-port telephone resi module with expansion jacks. Fits all 14", 21", and 28". Resi distribution center enclosures with the 4 locking buttons. UL listed. Modules compatible with most major manufacturers enclosures.