The Cisco 3600 series is a multifunction platform that combines dial access, routing, and LAN-to-LAN services and multiservice integration of voice, video and data in the same device. As a modular solution, the Cisco 3660 series has the flexibility to meet both current and future connectivity requirements. The Cisco 3600 series is fully supported by Cisco IOS software, which includes analog and digital voice capability, ATM access with T1/E1 IMA or OC-3 interfaces, dial-up connectivity, LAN-to-LAN routing, data and access security, WAN optimization, and multimedia features.