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CISCO2811-SRST/K9
2811 Voice Bundle w/ PVDM2-16,FL-SRST-35,SP Serv,128F/512D
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CISCO2811-SRST/K9 is a modular, integrated services router designed for secure enterprise branch connectivity with a robust architecture that supports a mix of WAN/LAN interfaces and power options. It incorporates flexible modular capabilities with integrated voice, video, and data services while offering redundant power support and advanced routing protocols to ensure reliable performance in diverse network environments.
CISCO2811-SRST/K9 delivers built-in VPN features for secure remote access, high throughput with optimized performance, and redundancy mechanisms essential for mission-critical applications. Its design makes it ideal for branch offices and small to medium enterprises requiring combined services, enhanced security, and modular scalability to address evolving connectivity requirements.
CISCO2811-SRST/K9 price is $1,676.00, a 54.6% saving from the Cisco list price of $3,695.00. CISCO2811-SRST/K9 is in stock and available for next-day dispatch. (terms applied)
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In a financial branch office with intermittent WAN reliability, deploying the Cisco 2811-SRST/K9 Voice Bundle with PVDM2-16 and FL-SRST-35 ensures uninterrupted local call processing when the central IP PBX is unreachable. Service Provider (SP) features deliver carrier-grade QoS and security, while the router’s 128 MB flash and 512 MB DRAM support near-instant failover. The outcome is seamless business continuity, zero dropped calls and maximized customer satisfaction during network outages.
A retail network with 30+ remote outlets requires simultaneous voice, video and conferencing services over a single platform. The Cisco 2811-SRST/K9 Voice Bundle with PVDM2-16 DSP modules provides up to 16 hardware-based transcoding channels and conferencing ports, while FL-SRST-35 adds PSTN fallback for up to 35 calls if the core SIP PBX goes offline. Built-in SP Serv and ample 128 MB flash/512 MB DRAM enable scalable, cost-effective voice aggregation and simplified infrastructure management.
An IT services firm must integrate SIP trunks securely to meet data-protection mandates and preserve call quality. The Cisco 2811-SRST/K9 Voice Bundle—equipped with PVDM2-16, FL-SRST-35 and SP Serv—offers service provider-grade encryption, advanced QoS policies and up to 35 local‐failover calls during core PBX maintenance. The robust 128 MB flash/512 MB DRAM hardware ensures low‐latency packet processing. The result is reduced telephony costs, guaranteed voice SLAs and full regulatory compliance.
To get the detailed certification, please go to the Compliance Center.
 CISCO2811-SRST/K9 |  C2811-VSEC-CUBE/K9 |  C2821-H-VSEC/K9 |  C2811-VSEC-SRST/K9 |  CISCO2811-V/K9 | |
|---|---|---|---|---|---|
| 5G Support | No | No | No | No | No |
| Architecture | Modular | Modular | Modular | Modular | Modular |
| Broadband | N/A | N/A | N/A | N/A | N/A |
| Built-in Security Features | Firewall / Intrusion Prevention / Malware Protection | Firewall / Intrusion Prevention | Firewall / Intrusion Prevention | Firewall / Intrusion Prevention | Firewall / Intrusion Prevention |
| Compliance Standards | FCC / CE | FCC / CE | RoHS / FCC | IEEE 802.3, IEEE 802.2 | FCC / CE |
| Connectivity Type | Wired | Wired | Wired | Wired | Wired |
| Depth | 14.96 inches | N/A | N/A | 14.6 inches | 12 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 | NIM | EHWIC / NIM | NIM | EHWIC | NIM / EHWIC |
| Features | VPN / IPv6 Compatible / Firewall | VPN / Firewall / Integrated Security / IPv6 Compatible | VPN / IPv6 Compatible / Firewall | VPN / Firewall / IPv6 Compatible | VPN / IPv6 Compatible / Firewall / MPLS |
| Firewall Features | Yes | Yes | Yes | Yes | Yes |
| Flash Memory | 128 MB | 128 MB | 256 MB | 256 MB | 128 MB |
| Form Factor | Rack-mount | Rack-mount | Rack-mount | Rack-mount | Rack-mount |
| Height | 1.72 inches | N/A | N/A | 1.75 inches | 1.75 inches |
| High Availability Support | Supported | Supported | Supported | Supported | Supported |
| Integrated Services | Voice / Video / WAN Optimization | Voice / Video / Data | Voice / Video | Voice | Voice / WAN Optimization |
| Interface Ports | RJ-45 | RJ-45 | RJ-45 | RJ-45 | RJ-45 / Console |
| LAN Ports | 2 LAN Ports | 2 LAN Ports | 4 LAN Ports | Modular LAN | Modular LAN |
| Management | Managed | Managed | Managed | Managed | Managed |
| Memory | 256 MB | 256 MB | 512 MB | 256 MB | 256 MB |
| Modular Slots Available | 2 Slots | 2 Slots | 2 Slots | 2 Slots | 2 Slots |
| Network Protocols | IPv4 / IPv6 | IPv4 / IPv6 | IPv4 / IPv6 | TCP/IP, IPX, AppleTalk | IPv4 / IPv6 |
| Power | 80W | 75 Watt | 100 W | 160 Watts | 125 Watts |
| Power Source | AC Power Supply / Redundant | AC Power Supply / Redundant | AC Power Supply | AC Power Supply | AC Power Supply |
| Product Name | CISCO2811-SRST/K9 | Cisco C2811-VSEC-CUBE/K9 Integrated Services Router | Cisco C2821-H-VSEC/K9 | Cisco 2811-VSEC-SRST/K9 | Cisco 2811 Integrated Services Router |
| Product Type | Enterprise Router | Enterprise Router | Enterprise Router | Enterprise Router | Enterprise Router |
| QoS Features | Supported | Supported | Supported | Supported | Supported |
| Remote Management | SSH / Telnet / SNMP | Telnet / SSH / SNMP | HTTP / CLI / SNMP | Telnet, SSH, SNMP | 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 | OSPF / BGP / EIGRP / RIP / Static Routing |
| Safety | N/A | N/A | N/A | N/A | N/A |
| Speed/Capacity | N/A | Fast Ethernet | Gigabit | N/A | N/A |
| Stacking Capability | No | No | No | No | No |
| Telecom | N/A | N/A | N/A | N/A | N/A |
| Throughput Capacity | 0.025 Gbps | 30 Mbps | 0.075 Gbps | 0.05 Gbps | 0.035 Gbps |
| Use Case | Enterprise / Small Business | Enterprise / Branch Office | Enterprise | Enterprise | Enterprise / Small Business |
| VPN Support | IPSec | IPSec / GRE / DMVPN / N/A | IPSec / SSL VPN / DMVPN | IPSec / DMVPN | IPSec |
| WAN Configuration | Dual WAN | Dual WAN | WAN | Dual WAN | Dual WAN |
| WAN Ports | 2 WAN | 2 WAN | 2 WAN | 2 WAN | Modular WAN |
| Weight | 21.52 lbs | N/A | N/A | 15 lbs | 14 lbs |
| Wi-Fi Standard | N/A | N/A | N/A | N/A | N/A |
| Width | 17.24 inches | N/A | N/A | 17.3 inches | 17 inches |
| Wireless Support | No | No | No | No | No |
Reliable SRST solution that kept our branch communications running during WAN outages. Voice failover worked smoothly and gave us confidence in business continuity.
Solid performance for survivable voice services. Easy to deploy and dependable during network disruptions, exactly what we needed for branch offices.
SRST functionality performed as expected. Calls stayed stable during link failures and overall voice quality remained consistent.
A dependable Cisco router for voice resiliency. Setup was straightforward and it has proven reliable in real world scenarios.
Good choice for branch voice protection. SRST kicked in seamlessly and minimized downtime for our users.
The Cisco 2811 Voice Bundle is an integrated router package featuring a PVDM2-16 DSP module, FL-SRST-35 fail-over licensing, Service Provider lifetime support, and 128 Mbps Fast Ethernet/512 kbps data performance.
The bundle includes a Cisco 2811 ISR, PVDM2-16 digital signal processor, FL-SRST-35 fail-over license, Service Provider SMARTnet lifetime support, and a 128 F/512 D performance license.
The PVDM2-16 module supports up to 16 G.711 calls or a mix of G.729G calls, allowing for enterprise-grade voice gateway performance.
FL-SRST-35 provides Survivable Remote Site Telephony fail-over for up to 35 IP phones, ensuring continuous voice services during WAN outages.