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C1861-SRST-B/K9
1861,8-user SRST or CME,4FXS, 2BRI, 8xPOE,SP Svcs, HWIC slot
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C1861-SRST-B/K9 is a fixed, enterprise-grade integrated services router built with a robust architecture that emphasizes secure connectivity and efficient performance. It features AC power supply options, integrated Ethernet interfaces for both WAN and LAN connectivity, and advanced VPN capabilities that ensure reliable remote site access.
The router supports modular expansion via dual EHWIC slots, delivering enhanced throughput performance of up to 0.035 Gbps and integrated voice services. Designed for small to medium branch office deployments, the C1861-SRST-B/K9 meets business use cases with built-in firewall protection, NAT, and a suite of routing protocols for dependable network redundancy and performance.
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Enterprises deploy the Cisco 1861 router in branch offices running SRST mode to maintain local call processing for up to eight IP phones whenever the WAN link fails. Integrated 8-user SRST and CME ensure uninterrupted voice service, emergency dialing and internal extensions remain available. Benefit: enhanced business continuity, zero voice downtime and consistent QoS for mission-critical communications.
Small to mid-sized campuses leverage the Cisco 1861’s eight PoE ports to power VoIP phones and wireless APs directly, eliminating separate power injectors and reducing rack footprint. With built-in CME and SP Svcs for secure VPN and QoS, IT teams can rapidly provision voice/data services while ensuring bandwidth prioritization. Benefit: simplified infrastructure, lower CAPEX/OPEX, and accelerated rollout of unified communications.
Service providers install the Cisco 1861 router at customer sites to deliver MPLS, secure VPN and traffic-shaping via SP Svcs, while eight PoE ports support on-premise IP phones and wireless APs. The 4 FXS and 2 BRI interfaces provide PSTN backup, and the HWIC slot allows plug-in LTE or additional voice modules for resilience. Benefit: SLA-backed multi-service delivery, scalable connectivity and guaranteed voice/data performance.
To get the detailed certification, please go to the Compliance Center.
| C1861-SRST-B/K9 |  CISCO1811/K9 |  C1861W-UC-2BRI-K9 |  C1861W-SRST-C-F/K9 |  C1861-4F-VSEC/K9 | |
|---|---|---|---|---|---|
| 5G Support | No | No | No | No | No |
| Architecture | Fixed | Fixed | Fixed | Fixed | Fixed |
| Broadband | N/A | N/A | N/A | N/A | N/A |
| Built-in Security Features | Firewall / Intrusion Prevention / Malware Protection | Firewall / Intrusion Prevention / Malware Protection | Firewall / Intrusion Prevention / Malware Protection | Firewall / Intrusion Prevention / Malware Protection | Firewall |
| Compliance Standards | IEEE 802.3 / IEEE 802.3u / FCC / CE | FCC, CE | FCC / CE | FCC / CE / UL | FCC, CE |
| Connectivity Type | Wired | Wired | Wired / Wireless | Wired | Wired |
| Depth | 12 inches | N/A | N/A | N/A | N/A |
| Device Type | Router | Router | Router | Router | Router |
| EMC | FCC / CE | N/A | N/A | N/A | N/A |
| Ethernet Technology | 10/100 | 10/100 | 10/100 | 10/100 | 10/100 |
| Expansion Slots | EHWIC | NIM | N/A | EHWIC | EHWIC |
| Features | VPN / Voice / NAT / Firewall | VPN / VoIP / IPv6 Compatible / Firewall | VPN / VoIP / Firewall / IPv6 Compatible | VPN / VoIP / IPv6 Compatible / Firewall | 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 | Desktop | Desktop | Desktop | Desktop | Desktop |
| Height | 1.72 inches | N/A | N/A | N/A | N/A |
| High Availability Support | Not Supported | Not Supported | Not Supported | Not Supported | Supported |
| Integrated Services | Voice | Voice | Voice | Voice | Voice |
| Interface Ports | RJ-45 | RJ-45 | RJ-45 | RJ-45 | RJ-45 |
| LAN Ports | Modular LAN | 4 LAN Ports | 4 LAN Ports | 4 LAN Ports | 4 LAN Ports |
| Management | Managed | Managed | Managed | Managed | Managed |
| Memory | 512 MB | 512 MB | 256 MB | 512 MB | 256 MB |
| Modular Slots Available | 2 Slots | 1 Slot | N/A | 1 Slot | 1 Slot |
| Network Protocols | IPv4 / IPv6 / MPLS / VPN | IPv4, IPv6 | TCP/IP, UDP, ICMP, IGMP | IPv4, IPv6, MPLS | IPv4, IPv6, NAT, PAT |
| Power | 45 Watt | 65 W | 65 Watts | 65W | 65 Watt |
| Power Source | AC Power Supply | AC Power Supply | AC Power Supply | AC Power Supply | AC Power Supply |
| Product Name | Cisco 1861 Integrated Services Router with SRST | CISCO1811/K9 Integrated Services Router | Cisco 1861W Integrated Services Router for Unified Communications | Cisco 1861W Integrated Services Router with SRST | Cisco C1861-4F-VSEC/K9 Integrated Services Router |
| Product Type | Enterprise Router | Enterprise Router | Enterprise Router | Enterprise Router | Enterprise Router |
| QoS Features | Supported | Supported | Supported | Supported | Supported |
| Remote Management | Telnet / SSH / SNMP | Telnet, SSH, SNMP | CLI, SNMP, HTTP/HTTPS | CLI, SNMP, HTTP/HTTPS | Telnet, SSH, SNMP |
| Routing Protocols | OSPF / EIGRP / RIP / BGP / Static Routing | OSPF / BGP / EIGRP / RIP / Static Routing | OSPF / BGP / EIGRP / RIP / Static Routing | OSPF / EIGRP / BGP / RIP / Static Routing | OSPF / EIGRP / RIP / BGP |
| Safety | UL / CE / RoHS | N/A | N/A | N/A | N/A |
| Speed/Capacity | Gigabit | N/A | N/A | Gigabit | N/A |
| Stacking Capability | No | No | No | No | No |
| Telecom | N/A | N/A | N/A | N/A | N/A |
| Throughput Capacity | 0.035 Gbps | 0.012 Gbps | 0.025 Gbps | N/A | 0.025 Gbps |
| Use Case | Enterprise / Small Business | Small Business | Business | Small Business | Business |
| VPN Support | IPSec / SSL VPN | IPSec | IPSec | IPSec / SSL VPN / DMVPN / N/A | IPSec |
| WAN Configuration | WAN | Dual WAN | WAN | Dual WAN | WAN |
| WAN Ports | 2 WAN | 2 WAN | 1 WAN | 2 WAN | 4 WAN |
| Weight | 9.5 lbs | N/A | N/A | N/A | N/A |
| Wi-Fi Standard | N/A | N/A | WiFi 3 | WiFi 4 | N/A |
| Width | 17 inches | N/A | N/A | N/A | N/A |
| Wireless Support | No | No | Yes | Yes | No |
Reliable 1861 with SRST and CME support. Ensures voice and data continuity during WAN outages.
Cisco 1861-SRST-B provides stable POE, WLAN, and voice services. Easy to configure for branch offices.
Strong performance under load. SRST backup keeps calls running smoothly.
Consistent uptime and robust security. Ideal for small offices with unified communication needs.
Trusted Cisco build quality. Ensures branch office continuity with minimal downtime.
The Cisco 1861 ISR is a branch office router optimized for small to medium enterprises, offering secure data, voice, and video services with support for SRST or CME fallback.
The Cisco 1861 ISR supports up to eight SRST or CME users with four FXS and two BRI ports for analog and ISDN voice connectivity.
The Cisco 1861 ISR provides eight integrated PoE ports delivering up to 15.4 W per port, enabling direct support for IP phones and wireless access points.
SRST is Cisco’s failover feature that ensures continuous telephony services at remote sites by maintaining call control locally if the connection to the central call manager is lost.
Yes, the 1861 ISR supports Cisco Unified Communications Manager Express (CME) to provide on-site call processing and advanced voice features without a separate call server.
The Cisco 1861 ISR supports broadband, MPLS, Metro Ethernet, and VPN services, enabling secure, high-performance WAN connectivity from a single platform.
Yes, the router features one HWIC slot for deploying additional network modules such as serial, wireless, or extra voice interfaces.
The Cisco 1861 ISR delivers up to 75 Mbps of aggregate data throughput, ideal for small branch office applications.
The Cisco 1861 ISR includes Cisco IOS Firewall, IPS, VPN (Site-to-Site and Remote Access), and Secure Boot for comprehensive branch security.
Yes, it supports both IPsec and SSL VPNs to secure site-to-site and remote user connections with hardware-accelerated encryption.
The Cisco 1861 ISR offers Cisco Unified Communications licensing for SRST or CME, bundled security packages, and performance-on-demand upgrades via SMART Net.
FXS and BRI ports are configured through the Cisco IOS command-line interface using voice port and dial-peer commands for analog and ISDN connectivity.
The 1861 ISR is compatible with Cisco Prime Infrastructure, SNMP, NetFlow, and Embedded Event Manager for real-time monitoring and proactive management.
The Cisco 1861 ISR measures 1.75 x 11.5 x 10.5 inches, weighs 3.5 lbs, and supports operating temperatures from 32°F to 104°F (0°C to 40°C).
Cisco provides a one-year limited hardware warranty with next-business-day replacement and optional SMART Net contracts for extended support.
The 1861 ISR is ideal for small branch offices, retail outlets, and teleworker sites requiring integrated voice, secure data, and wireless services on a single platform.