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CISCO2851-SRST/K9
2851 Voice Bundle w/ PVDM2-48,FL-SRST-100,SP Serv,128F/512D
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CISCO2851-SRST/K9 is a modular enterprise router designed with a robust architecture that integrates flexible power options—including redundant AC power—and versatile WAN interfaces to support secure connectivity through IPSec VPN and built-in firewall features. It delivers integrated services such as voice, efficient routing via protocols like OSPF, BGP, and EIGRP, and high availability options geared toward mission‐critical environments.
Engineered with modular expansion slots for both EHWIC and NIM cards, the CISCO2851-SRST/K9 supports dual WAN configurations and wired 10/100 Ethernet connectivity while providing comprehensive QoS and remote management capabilities. Its proven performance, redundancy, and scalability make it ideally suited for enterprise use cases demanding resilient network infrastructures.
CISCO2851-SRST/K9 price is $3,902.00, a 54.6% saving from the Cisco list price of $8,595.00. CISCO2851-SRST/K9 is in stock and available for next-day dispatch. (terms applied)
Request bulk order quote for CISCO2851-SRST/K9 for additional pricing. Browse the full Router Isr 2800 series or explore all Cisco products.
To get the detailed certification, please go to the Compliance Center.
 CISCO2851-SRST/K9 |  C2821-H-VSEC/K9 |  CISCO2821-AC-IP |  C2801-2SHDSL/K9 |  CISCO2851-SEC/K9 | |
|---|---|---|---|---|---|
| 5G Support | No | No | No | No | No |
| Architecture | Modular | Modular | Fixed | Modular | Fixed |
| Broadband | N/A | N/A | N/A | DSL | N/A |
| Built-in Security Features | Firewall / Intrusion Prevention | Firewall / Intrusion Prevention | Firewall / Intrusion Prevention | Firewall, Intrusion Prevention | Firewall / Intrusion Prevention / Malware Protection |
| Compliance Standards | FCC / CE / RoHS | RoHS / FCC | FCC / CE | FCC, CE | FCC / CE |
| Connectivity Type | Wired / Ethernet | Wired | Wired | Wired | Wired |
| Depth | N/A | N/A | 16.1 inches | 11.2 inches | 16 inches |
| Device Type | Router | Router | Router | Router | Router |
| EMC | N/A | N/A | N/A | N/A | N/A |
| Ethernet Technology | 10/100 | 10/100 | 10/100 | 10/100 | 10/100 |
| Expansion Slots | EHWIC / NIM | NIM | EHWIC | EHWIC, NIM | EHWIC / NIM |
| Features | VPN / VoIP / IPv6 Compatible / Firewall | VPN / IPv6 Compatible / Firewall | VPN / NAT / Firewall / IPv6 Compatible | VPN, NAT, QoS, Firewall, Integrated Services | VPN / Firewall / IPv6 Compatible |
| Firewall Features | Yes | Yes | Yes | Yes | Yes |
| Flash Memory | 256 MB | 256 MB | 128 MB | 128 MB | 256 MB |
| Form Factor | Rack-mount | Rack-mount | Rack-mount | Rack-mount | Rack-mount |
| Height | N/A | N/A | 1.73 inches | 1.8 inches | 4.3 inches |
| High Availability Support | Supported | Supported | Not Supported | Not Supported | Supported |
| Integrated Services | Voice | Voice / Video | Voice / Video / WAN Optimization | Voice, Data, Security | Voice / Video / WAN Optimization |
| Interface Ports | RJ-45 | RJ-45 | RJ-45 | RJ-45 | RJ-45 |
| LAN Ports | N/A | 4 LAN Ports | 2 LAN Ports | 2 LAN Ports | 4 LAN Ports |
| Management | Managed | Managed | Managed | Managed | Managed |
| Memory | 512 MB | 512 MB | 256 MB | 256 MB | 512 MB |
| Modular Slots Available | 2 Slots | 2 Slots | 2 Slots | 2 Slots | 2 Slots |
| Network Protocols | IPv4 / IPv6 | IPv4 / IPv6 | IPv4 / IPv6 | IPv4, IPv6 | IPv4, IPv6 |
| Power | 250W | 100 W | 150W | 60W | 65 W |
| Power Source | AC Power Supply / Redundant | AC Power Supply | AC Power Supply | AC Power Supply | AC Power Supply |
| Product Name | Cisco 2851-SRST/K9 | Cisco C2821-H-VSEC/K9 | Cisco 2821 AC-IP Integrated Services Router | Cisco C2801-2SHDSL/K9 Integrated Services Router | CISCO2851-SEC/K9 |
| Product Type | Enterprise Router | Enterprise Router | Enterprise Router | Enterprise Router | Enterprise Router |
| QoS Features | Supported | Supported | Supported | Supported | Supported |
| Remote Management | Telnet / SSH / SNMP | HTTP / CLI / SNMP | SSH / Telnet / SNMP | CLI, SNMP, Telnet, HTTP/HTTPS | CLI, SNMP |
| Routing Protocols | OSPF / BGP / EIGRP / RIP / Static Routing | OSPF / BGP / EIGRP / RIP / Static Routing | OSPF / EIGRP / RIP / Static Routing | OSPF, BGP, EIGRP, RIP | OSPF / BGP / EIGRP / RIP |
| Safety | N/A | N/A | N/A | N/A | N/A |
| Speed/Capacity | N/A | Gigabit | 10/100 | N/A | N/A |
| Stacking Capability | No | No | No | No | No |
| Telecom | N/A | N/A | N/A | N/A | N/A |
| Throughput Capacity | N/A | 0.075 Gbps | 0.075 Gbps | N/A | 0.025 Gbps |
| Use Case | Enterprise | Enterprise | Business / Enterprise | Enterprise, Branch Office | Enterprise |
| VPN Support | IPSec | IPSec / SSL VPN / DMVPN | IPSec / SSL VPN | IPSec, SSL VPN, GRE, DMVPN, FlexVPN | IPSec |
| WAN Configuration | Dual WAN | WAN | Dual WAN | Dual WAN | WAN |
| WAN Ports | 2 WAN | 2 WAN | 2 WAN | 2 WAN | 2 WAN |
| Weight | N/A | N/A | 13 lbs | 13 lbs | 25 lbs |
| Wi-Fi Standard | N/A | N/A | N/A | N/A | N/A |
| Width | N/A | N/A | 17.3 inches | 17.3 inches | 17.5 inches |
| Wireless Support | No | No | No | No | No |
Cisco 2851 SRST Voice Bundle ensures seamless voice continuity. PVDM2-48 and FL-SRST-100 provide stable UC during network outages.
Durable and predictable. Maintains uninterrupted voice services for medium branch offices with SRST fallback.
Easy to deploy and manage. Provides reliable UC and voice operations with minimal downtime.
High-performing and robust. Supports multiple voice endpoints efficiently while maintaining SRST continuity.
Reliable Cisco solution. Ideal for branches needing secure voice and UC continuity during network failures.
The Cisco 2851 Voice Bundle (CISCO2851-SRST/K9) is an integrated voice router solution featuring enhanced SRST, PVDM2-48 DSP modules, SP service licensing, 128 MB flash, and 512 MB DRAM for branch voice deployments.
The PVDM2-48 DSP module supports up to 48 voice channels, enabling high-density transcoding, conferencing, and fax relay for scalable VoIP applications.
FL-SRST-100 is a Survivable Remote Site Telephony license that provides fallback call-processing for up to 100 phones when the WAN link to the central Call Manager fails.
This bundle includes 512 MB of DRAM for routing and voice processing plus 128 MB of onboard flash for IOS images and configuration files.
