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C2851-VSEC-SRST/K9
2851 VSEC Bundle w/PVDM2-48,FL-SRST-100,AdvIPServ,128F/512D
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C2851-VSEC-SRST/K9 is an enterprise-grade fixed router engineered for robust branch connectivity. Built with a resilient architecture and diverse power options including redundant AC supply, it integrates dual WAN and multiple LAN interfaces to ensure seamless data connectivity and high availability even in demanding use cases.
C2851-VSEC-SRST/K9 delivers integrated services such as voice, video, and WAN optimization and supports advanced VPN features with IPSec and SSL encryption. Its modular capabilities, built-in firewall with intrusion prevention, and gigabit throughput make it an optimal solution for enterprises seeking reliable performance, redundancy, and secure remote management in modern network environments.
C2851-VSEC-SRST/K9 price is $4,357.00, a 54.6% saving from the Cisco list price of $9,595.00. C2851-VSEC-SRST/K9 is in stock and available for next-day dispatch. (terms applied)
Request bulk order quote for C2851-VSEC-SRST/K9 for additional pricing. Browse the full Router Isr 2800 series or explore all Cisco products.
In a multi-site retail network, the Cisco 2851 VSEC Bundle w/PVDM2-48, FL-SRST-100, AdvIPServ, 128F/512D provides local call processing when the primary Unified Communications Manager goes offline. FL-SRST-100 enables uninterrupted PSTN and VoIP service, while PVDM2-48 supports up to 48 simultaneous DSP-accelerated calls. Advanced IP Services deliver QoS-prioritized voice and data, and the integrated 128F/512D firewall secures branch LAN traffic. Benefit: Ensures zero downtime for customer transactions, preserves revenue during WAN outages, and maintains consistent call quality.
For distributed enterprises leveraging SaaS/IaaS, the Cisco 2851 VSEC Bundle acts as an MPLS edge router with Advanced IP Services for dynamic QoS, bandwidth shaping, and policy-based routing. PVDM2-48 provides DSP acceleration for high-definition video conferencing, while the built-in 128F/512D firewall enforces segmentation and compliance. Benefit: Achieves sub-50 ms latency for mission-critical cloud apps, boosts throughput by up to 30 percent, and consolidates security and routing in a single platform.
In healthcare or manufacturing environments with remote clinicians and IoT telemetry, the Cisco 2851 VSEC Bundle establishes scalable IPSec VPN tunnels with the integrated 128F/512D firewall and supports up to 200 concurrent sessions. PVDM2-48 DSP resources optimize voice/video diagnostics, and Advanced IP Services enable NAT-traversal and centralized policy enforcement. Benefit: Delivers secure, low-latency remote collaboration and IoT data integrity, reduces WAN costs by 25 percent, and ensures industry-grade compliance.
To get the detailed certification, please go to the Compliance Center.
| C2851-VSEC-SRST/K9 |  C2801-ADSL2-M/K9 |  C2801-VSEC-CUBE/K9 |  C2801-H-VSEC/K9 |  C2811-15UC/K9 | |
|---|---|---|---|---|---|
| 5G Support | No | No | No | No | |
| Architecture | Fixed | Modular | Fixed | Modular | |
| Broadband | N/A | DSL | N/A | N/A | |
| Built-in Security Features | Firewall, Intrusion Prevention, Malware Protection | Firewall, Intrusion Prevention, ACL | Firewall / Intrusion Prevention | Firewall / Intrusion Prevention / Malware Protection | |
| Compliance Standards | FCC, CE, UL | RoHS, FCC, CE | FCC / CE | FCC / CE | |
| Connectivity Type | Wired | Wired | Wired | Wired | |
| Depth | N/A | 16.3 inches | 15 inches | 17.48 in | |
| Device Type | Router | Router | Router / Voice Gateway | Router | |
| EMC | N/A | N/A | N/A | FCC | |
| Ethernet Technology | 10/100/1000 | 10/100 | 10/100 | 10/100 | |
| Expansion Slots | EHWIC | EHWIC / NIM | EHWIC | EHWIC | |
| Features | VPN, Firewall, Intrusion Prevention, IPv6 Compatible | VPN, Firewall, Integrated Services, Modular Expansion, DSL, Security | VPN / VoIP / IPv6 Compatible / Firewall | VPN / VoIP / IPv6 Compatible / Firewall / POE / MPLS | |
| Firewall Features | Yes | Yes | Yes | Yes | |
| Flash Memory | 256 MB | 128 MB | 256 MB | 256 MB | |
| Form Factor | Rack-mount | Rack-mount | Rack-mount | Rack-mount | |
| Height | N/A | 1.73 inches | 1.75 inches | 1.73 in | |
| High Availability Support | Supported | Supported | Supported | Not Supported | |
| Integrated Services | Voice, Video, WAN Optimization | Voice / Security / WAN Optimization | Voice / Video / WAN Optimization | Voice / Video / WAN Optimization | |
| Interface Ports | RJ-45, SFP | RJ-45 | RJ-45 | RJ-45 | |
| LAN Ports | 4 LAN Ports | 2 LAN Ports | 4 LAN Ports | 4 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 | IPv4, IPv6 | IPv4 / IPv6 | IPv4/IPv6 | |
| Power | 375 Watts | 65 W | 60 W | 250 Watts | |
| Power Source | AC Power Supply / Redundant | AC Power Supply | AC Power Supply / Redundant | AC Power Supply | |
| Product Name | Cisco C2851-VSEC-SRST/K9 | Cisco 2801 ADSL2 Integrated Services Router | Cisco 2801 VSEC CUBE | Cisco 2811 Integrated Services Router - 15 UC | |
| Product Type | Enterprise Router | Enterprise Router | Enterprise Router | Enterprise Router | |
| QoS Features | Supported | Supported | Supported | Supported | |
| Remote Management | Telnet, SSH, SNMP, HTTP/HTTPS | Telnet, SSH, SNMP, HTTP | Telnet / SSH / SNMP / HTTP | Telnet/SSH/SNMP | |
| Routing Protocols | OSPF / BGP / EIGRP / RIP / Static Routing | OSPF / BGP / EIGRP / RIP / Static Routing | OSPF / BGP / EIGRP / RIP / Static Routing | OSPF / BGP / EIGRP / RIP / Static Routing | |
| Safety | N/A | N/A | N/A | UL/cUL | |
| Speed/Capacity | Gigabit | Fast Ethernet | Fast Ethernet | Gigabit | |
| Stacking Capability | No | No | No | No | |
| Telecom | N/A | N/A | N/A | N/A | |
| Throughput Capacity | 100 Mbps | 75 Mbps | 37 Mbps | 15 Mbps | |
| Use Case | Enterprise | Business | Enterprise | Enterprise | |
| VPN Support | IPSec / SSL VPN / DMVPN | IPSec / SSL VPN | IPSec / SSL VPN / DMVPN / N/A | IPSec | |
| WAN Configuration | Dual WAN | WAN | Dual WAN | Dual WAN | |
| WAN Ports | 2 WAN | 1 WAN | 2 WAN | 2 WAN | |
| Weight | N/A | 19.2 lbs | 12 lbs | 15.93 lbs | |
| Wi-Fi Standard | N/A | N/A | N/A | N/A | |
| Width | N/A | 17.1 inches | 17 inches | 19.69 in | |
| Wireless Support | No | No | No | No |
Excellent router for SRST and voice security. It handled failover scenarios smoothly without impacting call quality.
Reliable performance for larger branch deployments. Voice services remained stable during outages.
Strong processing power and dependable SRST functionality. A trustworthy option for enterprise voice environments.
Cisco reliability shows here. Voice security and survivability features worked exactly as expected.
Good balance of performance and resilience. Ideal for branches needing consistent voice availability.
The Cisco C2851-VSEC-SRST/K9 bundle combines a 2851 Integrated Services Router with PVDM2-48 DSP module, FL-SRST-100 license, Advanced IP Services, and 128F/512D session capacity for secure, voice-enabled branch deployments.
The PVDM2-48 DSP module delivers high-density digital signal processing for up to 48 concurrent voice channels, enabling advanced VoIP services and conferencing on the 2851 router.
The FL-SRST-100 license activates Survivable Remote Site Telephony for up to 100 IP phones, ensuring continuous voice service during WAN outages by providing local call routing.
The Advanced IP Services license unlocks full routing protocol support (BGP, OSPF, EIGRP), MPLS, IPv6, and advanced QoS to optimize network performance in branch offices.
“128F/512D” specifies support for 128 fixed and 512 dynamic data sessions, balancing consistent throughput with flexible session allocation for varying traffic demands.
The 2851 VSEC bundle delivers up to 85 Mbps of total throughput and up to 45 Mbps of IPsec VPN throughput, ensuring secure, high-performance WAN connectivity.
This router supports up to 250 IPsec VPN tunnels natively, scalable with license upgrades, enabling secure site-to-site and remote access VPN connections.
Yes, it includes Cisco IOS Zone-Based Firewall for stateful packet inspection, intrusion prevention, and application visibility and control.
It supports VoIP, TDM integration, SIP trunking, and conferencing with up to 48 DSP channels via PVDM2-48, delivering comprehensive unified communications.
Yes, the router is modular and backward-compatible with Cisco ISR 2800 Series modules, allowing seamless upgrades of services and interface cards.
Install the license through Cisco’s License Registration Portal or CLI, then enable SRST in Cisco IOS and configure fallback profiles for telephony continuity.
The VSEC bundle offers integrated IPsec VPN, Zone-Based Firewall, intrusion prevention, secure segmentation, and advanced threat defense for branch protection.
Yes, with the Advanced IP Services license, the 2851 VSEC supports MPLS L3VPN, traffic engineering, and Fast Reroute for resilient, scalable WAN architectures.
The 2851 supports dual redundant power supplies (AC or DC) for high availability and features an energy-efficient design compliant with Cisco EnergyWise standards.
Cisco provides a 90-day limited warranty with the option to purchase SMARTnet service for extended hardware replacement, software updates, and around-the-clock technical support.
Enterprises and distributed branch offices requiring integrated security, advanced voice services, and high-performance routing will benefit most from this comprehensive bundle.