Abstract: A multipurpose dual-network router includes a housing that houses a motherboard formed of a PC board carrying a set of electronic devices, a power module and an antenna module. The motherboard is connectable to the internet and PSTN, providing data group filtering, data group forwarding, call-waiting priority leveling, encryption, compression and firewall functions and having multiple ports for the connection of one or a number of same or different applicable products, each port having an ID set subject to TCP/IP for interlinking, function switching or dialing a call. When connected to the internet and PSTN, multiple main units are allowed for one-way direct call. Thus, one single module of the invention provides stronger function than a combination of conventional products.