The WAN-interface-card (WIC) option offers a single ISDN BRI port (with optional NT1). The WIC-1B-S/T-V3 inserts into a mixed-media network module or is supported on the Cisco 1700 Series, Cisco1800 Series, Cisco 2600XM Series, Cisco 2800 Series, Cisco 3700 Series and Cisco 3800 Series routers. It provides a cost-effective ISDN router.