C2821-25UC/K9

The Cisco C2821-25UC/K9 is an enterprise-class integrated services router tailored for converged voice and data networks. Featuring the PVDM2-32 digital signal processor and AIM-CUE module, it delivers robust integrated call processing for unified communications deployments. With 25 CME/CUE phone licenses, dual Gigabit Ethernet LAN ports, and flexible HWIC and VIC expansion, this Cisco router enables secure VPN, firewall, and QoS services while simplifying branch and SMB voice migration across Asia, Europe, Africa, and North America.

Product Features Comparison

Model	C2821-25UC/K9, Cisco 2821 Router, 25 CME/CUE Lic/SP Serv/128F/512D	CISCO1941-2.5G/K9, Cisco 1941 Router, 2.5GB DRAM/256MB Flash	C3945-VSEC-CUBE/K9, Cisco C3945 Integrated Services Router, PVDM3-64/UC SEC Lic/FL-CUBEE-25	C2901-WAASX/K9, Cisco C2900 Router, WAASX feature/Max memory
Brand	Cisco	Cisco	Cisco	Cisco
Routing Throughput	n/a	n/a	n/a	n/a
Interface Configuration	2 x 10/100/1000 Mbps LAN Ports; 4 HWIC slots, 1 enhanced VIC slot	Router Interfaces: 1 x 10Base-T/100Base-TX/1000Base-T - RJ-45; Management: 1 x console - RJ-45; Management: 1 x console - mini-USB Type B; Serial: 1 x auxiliary - RJ-45; USB: 2 x 4-pin USB Type A; Expansion Slot(s): 2 (total) / 2 (free) x HWIC; 2 (total) / 1 (free) x CompactFlash Card; 1 (total) / 1 (free) x Expansion Slot	Router Interfaces: 3 x 10Base-T/100Base-TX/1000Base-T RJ-45; Management: 1 x console RJ-45; Management: 1 x console mini-USB Type B; Serial: 1 x auxiliary RJ-45; USB: 2 x USB Type-A (4-pin); 2 x SFP (mini-GBIC); Expansion Slots Total (Free): 4 (4) x HWIC; 3 (2) x PVDM; 2 (1) x CompactFlash Card; 1 (1) x expansion slot	Router Interfaces: 2 x 10Base-T/100Base-TX/1000Base-T (RJ-45); Management: 1 x console (RJ-45), 1 x console (mini-USB Type B); Serial: 1 x auxiliary (RJ-45); USB: 2 x 4-pin USB Type A; Expansion Slots: 4 x EHWIC; 2 x PVDM; 2 x CompactFlash Card; 1 x ISM; Power Device: Internal power supply
Supported Protocol	IPv4/IPv6, MPLS, BGP	Network / Transport Protocol: IPSec, L2TPv3; Routing Protocol: OSPF, IS-IS, BGP, EIGRP, DVMRP, PIM-SM, IGMPv3, GRE, PIM-SSM, static IPv4 routing, static IPv6 routing	Network / Transport Protocol: TCP/IP, UDP/IP, RSVP, IPSec, PPPoE, L2TPv3; Routing Protocol: OSPF, IS-IS, BGP, EIGRP, DVMRP, PIM-SM, IGMPv3, GRE, PIM-SSM, static IPv4 routing, static IPv6 routing, policy-based routing (PBR)	Routing Protocols: OSPF, IS-IS, BGP, EIGRP, DVMRP, PIM-SM, IGMPv3, GRE, PIM-SSM, static IPv4 routing, static IPv6 routing, policy-based routing (PBR); Data Link Protocol: Ethernet, Fast Ethernet, Gigabit Ethernet
VPN Capability	Integrated firewall and VPN	Features: Firewall protection, VPN support, MPLS support, Syslog support, IPv6 support, Class-Based Weighted Fair Queuing (CBWFQ), Weighted Random Early Detection (WRED)	Features: Firewall protection, NAT support, VPN support, MPLS support, Syslog support, content filtering, IPv6 support, Class-Based Weighted Fair Queuing (CBWFQ), Weighted Random Early Detection (WRED), Quality of Service (QoS), Dynamic Multipoint VPN (DMVPN)	Features: Firewall protection, VPN support, MPLS support, Syslog support, IPv6 support, Class-Based Weighted Fair Queuing (CBWFQ), Weighted Random Early Detection (WRED)
Integrated Features	Digital Signal Processor: PVDM2-32; Advanced Integration Module: AIM-CUE; Voice Capabilities: Integrated call processing; Management: Web-based management interface; QoS: Traffic shaping and policing; Compliance: RoHS, UL, CE	Features: Firewall protection, VPN support, MPLS support, Syslog support, IPv6 support, CBWFQ, WRED; DRAM Memory: 2.5 GB; Flash Memory: 256 MB (installed) / 8 GB (max)	Features: Firewall protection, NAT support, VPN support, MPLS support, Syslog support, content filtering, IPv6 support, CBWFQ, WRED, QoS, DMVPN; Communications Type: Voice / fax module; VoIP Protocols: H.323, SIP	Features: Firewall protection, VPN support, MPLS support, Syslog support, IPv6 support, CBWFQ, WRED; Additional Software: Cisco Wide Area Application Services Express; IOS Software Included: Cisco IOS IP Base