The network modules provide various port densities to meet customer requirements at various price points. The optional, integrated NT1 lets customers consolidate customer premises equipment (CPE) to provide multifunction dial access server, router, and other capabilities within the Cisco routers in power-branch-office environments. 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 (part number NM-1FE2W-V2, NM-2FE2W-V2, NM-1FE1R2W or NM-2W) or is supported on the Cisco 1700 Series, Cisco 1800 Series, Cisco 2600XM Series, Cisco 2800 Series, Cisco 3700 Series and Cisco 3800 Series routers.