Cisco C2911-VSEC/K9 Integrated Services Router

The Cisco C2911-VSEC/K9 Integrated Services Router is a rack‑mount enterprise router in the Cisco 2900 Series ISR G2, designed to deliver secure WAN connectivity with integrated voice processing for branch offices and distributed networks. It runs Cisco IOS 15.7 and uses a multi‑core CPU with a PVDM3-16 Voice DSP Module to support VoIP gateway functionality, hardware‑based VPN acceleration, and firewall capabilities. The unit offers modular WAN interface slots and integrated Gigabit Ethernet LAN ports, plus expansion support for EHWIC, DSP, and service modules to scale both data and voice services. Common replacements include Cisco C2911/K9, Cisco C2921-VSEC/K9, and Cisco ISR4331/K9, underscoring its role in upgrading legacy gateways to modern voice and security‑enabled routing.