Cisco IOS v.12.4(6)XE - IP SUBSET/IPSEC 64 BIT/VOICE - Complete Product - Firmware

Cisco IOS Software is the world's leading network infrastructure software, delivering a seamless integration of technology innovation, business-critical services, and hardware support. Currently operating on millions of active systems, ranging from the small home office router to the core systems of the world's largest service provider networks, Cisco IOS Software is the most widely leveraged network infrastructure software in the world.