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C1861W-SRST-B/K9
1861,WLAN,8-user SRST/CME,4FXS,2BRI,8xPOE,SP Svcs,HWIC slot
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C1861W-SRST-B/K9 is built on a fixed, integrated architecture with an AC power supply design that supports dual WAN interfaces and four LAN Ethernet 10/100 ports. It is equipped with modular expansion capabilities via a NIM slot and integrates advanced voice and video services for seamless enterprise connectivity.
C1861W-SRST-B/K9 supports robust VPN features such as IPSec, SSL VPN, DMVPN, and GRE, delivering up to 0.085 Gbps throughput along with redundancy and high availability support. Its optimized performance, stateful firewall protection with intrusion prevention and malware protection, and remote management via SSH, Telnet, and SNMP make it ideally suited for business and small business branch deployments.
C1861W-SRST-B/K9 price is is available on request. Get immediate quote.
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In a distributed enterprise branch, the Cisco C1861W-SRST-B/K9-1861 delivers integrated secure WLAN and 8-user SRST/CME with 4 FXS and 2 BRI PSTN backup. It powers IP phones via 8 PoE ports and maintains local call processing during WAN outages, ensuring uninterrupted voice services, higher uptime, and reduced hardware footprint.
At a retail outlet, the Cisco C1861W-SRST-B/K9-1861 consolidates wired LAN, Wi-Fi, and PoE for POS terminals and security cameras, with dual BRI for PSTN fallback and an HWIC slot for 4G backup. Embedded SRST/CME ensures call continuity during WAN failures, optimizing reliability, minimizing capital expenditure, and simplifying branch IT operations.
In a remote clinic, the Cisco C1861W-SRST-B/K9-1861 provides WPA2-Enterprise WLAN for patient and staff devices, 8 PoE ports for IP phones and medical IoT sensors, 4 FXS for analog medical alarms, and SRST/CME for local call failover. This delivers high availability, healthcare-grade security compliance, and streamlined network management.
To get the detailed certification, please go to the Compliance Center.
| C1861W-SRST-B/K9 |  CISCO1812/K9 |  CISCO1803/K9 |  CISCO1801WM-AGB/K9 |  C1841-3G-G | |
|---|---|---|---|---|---|
| 5G Support | No | No | No | No | No |
| Architecture | Fixed | Fixed | Fixed | Fixed | Fixed |
| Broadband | N/A | DSL | N/A | N/A | N/A |
| Built-in Security Features | Firewall, Intrusion Prevention, Malware Protection | Firewall / Intrusion Prevention | Firewall / Intrusion Prevention / Malware Protection | Firewall / Intrusion Prevention | Firewall / Intrusion Prevention |
| Compliance Standards | FCC, CE, UL | IEEE802.3, IEEE802.3u, FCC, CE | FCC / CE | FCC / CE | IEEE 802.3, IEEE 802.3u |
| Connectivity Type | Wired / Wireless | Wired | Wired | Wired / Wireless | Wired |
| Depth | N/A | N/A | N/A | N/A | N/A |
| 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 | EHWIC | EHWIC | EHWIC |
| Features | VPN, Firewall, Integrated Services, IPv6 Compatible | VPN, VoIP, IPv6 Compatible, Firewall, MPLS | VPN / IPv6 Compatible / Firewall / Voice | VPN / IPv6 Compatible / Firewall | VPN / IPv6 Compatible / Firewall |
| Firewall Features | Yes | Yes | Yes | Yes | Yes |
| Flash Memory | 256 MB | 256 MB | 128 MB | 256 MB | 256 MB |
| Form Factor | Desktop | Rack-mount / Desktop | Rack-mount | Desktop | Rack-mount |
| Height | N/A | N/A | 1.75 inches | N/A | N/A |
| High Availability Support | Supported | Supported | Not Supported | Not Supported | Not Supported |
| Integrated Services | Voice, Video | Voice / Video | Voice / Video | Voice / Video | Voice |
| Interface Ports | RJ-45 | RJ-45 | RJ-45 | RJ-45 / Combo Ports | RJ-45 |
| LAN Ports | 4 LAN Ports | 4 LAN Ports | 4 LAN Ports | 4 LAN Ports | N/A |
| Management | Managed | Managed | Managed | Managed | Managed |
| Memory | 256 MB | 512 MB | 256 MB | 512 MB | 128 MB |
| Modular Slots Available | 2 Slots | 1 Slot | 2 Slots | 2 Slots | 2 Slots |
| Network Protocols | IPv4, IPv6 | IPv4 / IPv6 | TCP/IP / IPX | IPv4 / IPv6 | IPv4, IPv6, MPLS |
| Power | 40W | 65W | 65 Watts | 65 Watt | 73 W |
| Power Source | AC Power Supply | AC Power Supply / Redundant | AC Power Supply | AC Power Supply | AC Power Supply |
| Product Name | Cisco 1861 Wireless Services Router | CISCO1812/K9 Integrated Services Router | Cisco 1803/K9 Integrated Services Router | CISCO1801WM-AGB/K9 | Cisco 1841-3G-G |
| Product Type | Enterprise Router | Integrated Services Router | Enterprise Router | Enterprise Router | Enterprise Router |
| QoS Features | Supported | Supported | Supported | Supported | Supported |
| Remote Management | SSH, Telnet, SNMP | CLI / SNMP / Telnet / SSH | 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 / Static Routing | OSPF / EIGRP / RIP / Static Routing |
| Safety | N/A | N/A | N/A | N/A | N/A |
| Speed/Capacity | Gigabit | Fast Ethernet | Fast Ethernet | Gigabit | N/A |
| Stacking Capability | No | No | No | No | No |
| Telecom | N/A | N/A | N/A | N/A | N/A |
| Throughput Capacity | 0.085 Gbps | N/A | 25 Mbps | 0.05 Gbps | 0.045 Gbps |
| Use Case | Business / Small Business | Business / Small Business | Small Business / Enterprise | Enterprise | Small Business |
| VPN Support | IPSec / SSL VPN / DMVPN / GRE | IPSec / SSL VPN / DMVPN | IPSec / GRE / DMVPN | IPSec | 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 | 6.6 lbs | N/A | N/A |
| Wi-Fi Standard | WiFi 4 | N/A | N/A | WiFi 3 | N/A |
| Width | N/A | N/A | 17 inches | N/A | N/A |
| Wireless Support | Yes | No | No | Yes | No |
Reliable 1861W with strong SRST and CME features. Voice and data run smoothly across the office.
Cisco 1861W-SRST-B ensures seamless voice continuity during WAN outages. Easy to configure and manage.
Consistent performance with integrated WLAN and POE support. Excellent branch office solution.
Handles voice, data, and POE devices reliably. A solid all-in-one router for small offices.
Trusted Cisco reliability. SRST backup works flawlessly under load.
The Cisco 1861W (C1861W-SRST-B/K9) is an integrated branch router with 802.11n wireless, 8-user SRST/CME voice fallback, 4 FXS ports, 2 BRI interfaces, 8 PoE ports, SP Services IOS and one HWIC slot.
Key features include integrated dual-band 802.11n WLAN; up to 8-user SRST for voice redundancy; 4 FXS analog ports; 2 BRI S/T ISDN interfaces; 8 PoE Fast Ethernet ports (123 W total); Cisco SP Services IOS; one HWIC slot.
The 1861W supports up to 8 concurrent SRST (Survivable Remote Site Telephony) users for Cisco Unified Communications Manager fallback during WAN outages.
Cisco SRST (Survivable Remote Site Telephony) provides dial-tone service locally when connection to CUCM is lost by running a lightweight call-processing agent on the router.
The router includes 4 FXS ports for connecting analog phones, fax machines and key systems directly to the voice gateway.
It features 2 ISDN BRI S/T interfaces for primary or backup ISDN voice and data connectivity.
The device offers 8 IEEE 802.3af PoE-enabled Fast Ethernet ports with a total power budget of 123 W, ideal for IP phones and access points.
The router runs the Cisco Service Provider Advanced IP Services IOS, enabling MPLS, advanced QoS, VPNs, multicast and comprehensive routing protocols.
It integrates a dual-band 802.11n access point delivering up to 300 Mbps, supporting WPA2-PSK, 802.1X authentication and advanced RF management.
The single Cisco High-Speed WAN Interface Card (HWIC) slot allows installation of additional WAN modules such as T1/E1, serial, voice or security interface cards.
Standard auto-sensing 110–240 VAC, 47–63 Hz power module is included; optional DC power inputs and redundant power modules are available via service module.
Ideal for small to medium branch offices requiring converged data, voice and wireless: secure WAN connectivity, IP telephony with SRST fallback and integrated WLAN.
Use the IOS CLI: enable telephony-service, define SRST parameters, configure dial-peers and ephone/ephone-template profiles; save and reload for activation.
CME is the router-based call manager for small sites providing full telephony features; SRST is a backup mode offering basic dial-tone if CME/CUCM is unreachable.
Yes. It supports an optional 19″ rack-mount kit and rubber feet for desktop deployment, allowing flexible installation in wiring closets or on desks.
Includes limited lifetime hardware warranty. Cisco SMARTnet® contracts deliver 24x7 technical support, OS updates, and advance hardware replacement services.