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C2821-25UC/K9
2821 w/ PVDM2-32,AIM-CUE,25 CME/CUE/Ph lic,SP Serv,128F/512D
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C2821-25UC/K9 is an integrated services router engineered for enterprise environments where robust performance and secure connectivity are critical. Built on a fixed architecture with an AC power supply, it delivers reliable WAN and LAN connectivity through integrated 10/100 Ethernet interfaces while providing comprehensive services such as voice and VPN support. Its design accommodates modular expansion via EHWIC slots, ensuring flexibility and future growth without sacrificing performance or redundancy.
Optimized for demanding networks, the C2821-25UC/K9 offers a throughput capacity of up to 25 Mbps and advanced VPN features—including IPSec, SSL VPN, and DMVPN—for secure communication across distributed locations. Supporting industry-standard routing protocols like OSPF, EIGRP, BGP, and RIP, this router is ideally suited for enterprise and business use cases that require integrated voice services, scalable performance, and high availability.
C2821-25UC/K9 price is $4,811.00, a 54.6% saving from the Cisco list price of $10,595.00. C2821-25UC/K9 is in stock and available for next-day dispatch. (terms applied)
Request bulk order quote for C2821-25UC/K9 for additional pricing. Browse the full Router Isr 2800 series or explore all Cisco products.
In a multi-site professional services firm, the Cisco C2821-25UC/K9-2821 with PVDM2-32, AIM-CUE, 25-seat CME/CUE/Ph licensing, SP Services and 128 MB flash/512 MB DRAM delivers on-premises IP telephony and Unity Express voicemail for up to 25 extensions per branch. This all-in-one router consolidates WAN routing and voice services, reducing hardware footprint by 60%, cutting OPEX by 30%, and ensuring HD voice quality with integrated QoS.
A regional service provider deploys the C2821-25UC/K9-2821 as a multiservice edge router, leveraging PVDM2-32 DSP modules, SP Services and unified CME/CUE/Ph licenses to terminate and manage SMB voice traffic. The integrated platform enforces granular QoS policies, ensures 99.9% SLA uptime, and optimizes bandwidth usage by 50%, while streamlining multi-tenant voice provisioning and monitoring.
A mid-market contact center uses the Cisco 2821-25UC/K9-2821 with AIM-CUE, 25-seat CME/CUE/Ph licensing, and PVDM2-32 to host local IVR, voicemail and PSTN failover at remote sites. With 128 MB flash/512 MB DRAM and built-in SP Services, each micro-branch maintains uninterrupted voice operations during WAN outages, improves first-call resolution by 15%, and simplifies management through centralized configurations.
To get the detailed certification, please go to the Compliance Center.
 C2821-25UC/K9 |  CISCO2851-WAE/K9 |  CISCO2821-SEC/K9 |  C2811-VSEC-CUBE/K9 |  C2801-H-VSEC/K9 | |
|---|---|---|---|---|---|
| 5G Support | No | No | No | No | |
| Architecture | Fixed | Modular | Fixed | Modular | |
| Broadband | N/A | N/A | N/A | N/A | |
| Built-in Security Features | Firewall / Intrusion Prevention | Firewall, Intrusion Prevention, Malware Protection | Firewall, Intrusion Prevention, VPN | Firewall / Intrusion Prevention | |
| Compliance Standards | FCC / CE | FCC, CE, UL | RoHS, FCC, CE | FCC / CE | |
| Connectivity Type | Wired | Wired / Wireless / Ethernet | Wired | Wired | |
| Depth | N/A | 11.3 inches | 14.0 inches | N/A | |
| Device Type | Router | Router | Router | Router | |
| EMC | N/A | N/A | N/A | N/A | |
| Ethernet Technology | 10/100 | 10/100 | 10/100 | 10/100 | |
| Expansion Slots | EHWIC | EHWIC | EHWIC | EHWIC / NIM | |
| Features | VPN / VoIP / IPv6 Compatible / Firewall | Voice, VPN, IPv6 Compatible, Firewall | VPN, Firewall, Intrusion Prevention, IPv6 Compatible | VPN / Firewall / Integrated Security / IPv6 Compatible | |
| Firewall Features | Yes | Yes | Yes | Yes | |
| Flash Memory | 128 MB | 256 MB | 256 MB | 128 MB | |
| Form Factor | Rack-mount | Rack-mount | Rack-mount, Desktop | Rack-mount | |
| Height | N/A | 1.73 inches | 3.0 inches | N/A | |
| High Availability Support | Supported | Not Supported | Supported | Supported | |
| Integrated Services | Voice | Voice, Data, Security, Wireless | Voice, Video, WAN Optimization | Voice / Video / Data | |
| Interface Ports | RJ-45 | RJ-45 | RJ-45 | RJ-45 | |
| LAN Ports | 4 LAN Ports | 4 LAN Ports | N/A | 2 LAN Ports | |
| Management | Managed | Managed | Managed | Managed | |
| Memory | 256 MB | 256 MB | 256 MB | 256 MB | |
| Modular Slots Available | 2 Slots | 2 Slots | 2 Slots | 2 Slots | |
| Network Protocols | IPv4 / IPv6 / MPLS | IPv4, IPv6 | IPv4, IPv6 | IPv4 / IPv6 | |
| Power | 85 Watt | 70W | 65 W | 75 Watt | |
| Power Source | AC Power Supply | AC Power Supply | AC Power Supply / Redundant | AC Power Supply / Redundant | |
| Product Name | Cisco C2821-25UC/K9 Integrated Services Router | Cisco 2851 Integrated Services Router - Wireless Access Edition | Cisco 2821 Integrated Services Router Security (CISCO2821-SEC/K9) | Cisco C2811-VSEC-CUBE/K9 Integrated Services Router | |
| Product Type | Enterprise Router | Enterprise Router | Enterprise Router | Enterprise Router | |
| QoS Features | Supported | Supported | Supported | Supported | |
| Remote Management | Telnet / SSH / SNMP | SNMP, Telnet, SSH | SSH, Telnet, SNMP | Telnet / SSH / SNMP | |
| Routing Protocols | OSPF / BGP / EIGRP / RIP / Static Routing | OSPF / EIGRP / BGP / RIP / Static Routing | OSPF / BGP / EIGRP / RIP / Static Routing | OSPF / BGP / EIGRP / RIP / Static Routing | |
| Safety | N/A | N/A | N/A | N/A | |
| Speed/Capacity | 10/100 | 10/100 | N/A | Fast Ethernet | |
| Stacking Capability | No | No | No | No | |
| Telecom | N/A | N/A | N/A | N/A | |
| Throughput Capacity | 25 Mbps | 25 Mbps | 0.075 Gbps | 30 Mbps | |
| Use Case | Enterprise | Enterprise | Enterprise, Business | Enterprise / Branch Office | |
| VPN Support | IPSec / SSL VPN / DMVPN / N/A | IPSec / GRE / DMVPN | IPSec / SSL VPN / N/A | IPSec / GRE / DMVPN / N/A | |
| WAN Configuration | WAN | Dual WAN | Dual WAN | Dual WAN | |
| WAN Ports | 2 WAN | 2 WAN | 2 WAN | 2 WAN | |
| Weight | N/A | 15.6 lbs | 12 lbs | N/A | |
| Wi-Fi Standard | N/A | WiFi 4 | N/A | N/A | |
| Width | N/A | 17.0 inches | 17.0 inches | N/A | |
| Wireless Support | No | Yes | No | No |
Cisco 2821 Voice Bundle with 25 CME/CUE licenses delivers reliable UC and voice services. PVDM2-32 supports smooth branch operations.
Durable and predictable. Handles multiple voice endpoints efficiently while maintaining stable UC performance.
Easy to deploy and manage. Provides seamless UC, voice, and network operations with minimal downtime.
Reliable Cisco solution. Supports small to medium branches with high-quality voice and UC services.
High-performing and robust. Ideal for offices needing predictable UC and voice communications.
The Cisco 2821 (SKU C2821-25UC/K9) is a second-generation integrated services router with PVDM2-32 DSPs, AIM-CUE voicemail, 25 CME/CUE phone licenses, SP services, 128MB flash and 512MB DRAM, designed for secure voice and data convergence in small to medium enterprises.
PVDM2-32 refers to the Packet Voice Digital Signal Processor Module 2 with 32 DSP channels, enabling up to 32 simultaneous voice calls, conferencing, transcoding and media services on the Cisco 2821 platform.
AIM-CUE stands for Application Integration Module with Cisco Unity Express, providing integrated voicemail, auto attendant and messaging services directly on the Cisco 2821 router without external servers.
The C2821-25UC/K9 includes 25 Cisco Unified Communications Manager Express (CME), Cisco Unity Express (CUE) and phone licenses, supporting up to 25 IP endpoints and mailboxes out of the box.