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Name:
C1861W-SRST-B/K9
- Description:
- 1861,WLAN,8-user SRST/CME,4FXS,2BRI,8xPOE,SP Svcs,HWIC slot
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- 882658208157
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C1861W-SRST-B/K9 Overview
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.
What is the price of C1861W-SRST-B/K9?
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C1861W-SRST-B/K9 Specifications
| Product Type | Enterprise Router |
| VPN Support | IPSec / SSL VPN / DMVPN / GRE |
| Power Source | AC Power Supply |
| Routing Protocols | OSPF / BGP / EIGRP / RIP / Static Routing |
| Broadband | N/A |
| Architecture | Fixed |
| WAN Configuration | Dual WAN |
| WAN Ports | 2 WAN |
| LAN Ports | 4 LAN Ports |
| Ethernet Technology | 10/100 |
| Wi-Fi Standard | WiFi 4 |
| Connectivity Type | Wired / Wireless |
| Network Protocols | IPv4, IPv6 |
| Remote Management | SSH, Telnet, SNMP |
| Compliance Standards | FCC, CE, UL |
| Wireless Support | Yes |
| Speed/Capacity | Gigabit |
| Firewall Features | Yes |
| Features | VPN, Firewall, Integrated Services, IPv6 Compatible |
| Use Case | Business / Small Business |
| Management | Managed |
| Form Factor | Desktop |
| Integrated Services | Voice, Video |
| High Availability Support | Supported |
| Safety | N/A |
| EMC | N/A |
| Telecom | N/A |
| Throughput Capacity | 0.085 Gbps |
| QoS Features | Supported |
| Built-in Security Features | Firewall, Intrusion Prevention, Malware Protection |
| Expansion Slots | NIM |
| Modular Slots Available | 2 Slots |
| Stacking Capability | No |
| 5G Support | No |
| Memory | 256 MB |
| Flash Memory | 256 MB |
| Interface Ports | RJ-45 |
| Power | 40W |
| Device Type | Router |
| Product Name | Cisco 1861 Wireless Services Router |
| Height | N/A |
| Width | N/A |
| Depth | N/A |
| Weight | N/A |
C1861W-SRST-B/K9 Use Case
Branch Office Voice Failover and Secure WLAN with Cisco C1861W-SRST-B/K9-1861
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.
Retail Store Network Consolidation and Link Redundancy with Cisco C1861W-SRST-B/K9-1861
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.
Healthcare Clinic High-Availability Telephony and Secure Device Connectivity
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.
Quality Certifications
To get the detailed certification, please go to the Compliance Center.
Product Comparison Table
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| 5G Support | No | No | No | No | No |
| Architecture | Fixed | Fixed | Fixed | Fixed | Fixed |
| Broadband | N/A | N/A | DSL | 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 / Malware Protection |
| Compliance Standards | FCC, CE, UL | IEEE 802.3, IEEE 802.3u | IEEE802.3, IEEE802.3u, FCC, CE | FCC / CE | FCC / CE |
| 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 / IPv6 Compatible / Firewall | VPN, VoIP, IPv6 Compatible, Firewall, MPLS | VPN / IPv6 Compatible / Firewall | VPN / IPv6 Compatible / Firewall / Voice |
| Firewall Features | Yes | Yes | Yes | Yes | Yes |
| Flash Memory | 256 MB | 256 MB | 256 MB | 256 MB | 128 MB |
| Form Factor | Desktop | Rack-mount | Rack-mount / Desktop | Desktop | Rack-mount |
| Height | N/A | N/A | N/A | N/A | 1.75 inches |
| High Availability Support | Supported | Not Supported | Supported | Not Supported | Not Supported |
| Integrated Services | Voice, Video | Voice | Voice / Video | Voice / Video | Voice / Video |
| Interface Ports | RJ-45 | RJ-45 | RJ-45 | RJ-45 / Combo Ports | RJ-45 |
| LAN Ports | 4 LAN Ports | N/A | 4 LAN Ports | 4 LAN Ports | 4 LAN Ports |
| Management | Managed | Managed | Managed | Managed | Managed |
| Memory | 256 MB | 128 MB | 512 MB | 512 MB | 256 MB |
| Modular Slots Available | 2 Slots | 2 Slots | 1 Slot | 2 Slots | 2 Slots |
| Network Protocols | IPv4, IPv6 | IPv4, IPv6, MPLS | IPv4 / IPv6 | IPv4 / IPv6 | TCP/IP / IPX |
| Power | 40W | 73 W | 65W | 65 Watt | 65 Watts |
| Power Source | AC Power Supply | AC Power Supply | AC Power Supply / Redundant | AC Power Supply | AC Power Supply |
| Product Name | Cisco 1861 Wireless Services Router | Cisco 1841-3G-G | CISCO1812/K9 Integrated Services Router | CISCO1801WM-AGB/K9 | Cisco 1803/K9 Integrated Services Router |
| Product Type | Enterprise Router | Enterprise Router | Integrated Services Router | Enterprise Router | Enterprise Router |
| QoS Features | Supported | Supported | Supported | Supported | Supported |
| Remote Management | SSH, Telnet, SNMP | Telnet, SSH, SNMP | CLI / SNMP / Telnet / SSH | Telnet / SSH / SNMP | CLI / SNMP |
| Routing Protocols | OSPF / BGP / EIGRP / RIP / Static Routing | OSPF / EIGRP / RIP / Static Routing | OSPF / BGP / EIGRP / RIP / Static Routing | OSPF / BGP / EIGRP / Static Routing | OSPF / BGP / EIGRP / RIP / Static Routing |
| Safety | N/A | N/A | N/A | N/A | N/A |
| Speed/Capacity | Gigabit | N/A | Fast Ethernet | Gigabit | Fast Ethernet |
| Stacking Capability | No | No | No | No | No |
| Telecom | N/A | N/A | N/A | N/A | N/A |
| Throughput Capacity | 0.085 Gbps | 0.045 Gbps | N/A | 0.05 Gbps | 25 Mbps |
| Use Case | Business / Small Business | Small Business | Business / Small Business | Enterprise | Small Business / Enterprise |
| VPN Support | IPSec / SSL VPN / DMVPN / GRE | IPSec | IPSec / SSL VPN / DMVPN | IPSec | IPSec / GRE / DMVPN |
| WAN Configuration | Dual WAN | WAN | WAN | Dual WAN | Dual WAN |
| WAN Ports | 2 WAN | 2 WAN | 2 WAN | 2 WAN | 2 WAN |
| Weight | N/A | N/A | N/A | N/A | 6.6 lbs |
| Wi-Fi Standard | WiFi 4 | N/A | N/A | WiFi 3 | N/A |
| Width | N/A | N/A | N/A | N/A | 17 inches |
| Wireless Support | Yes | No | No | Yes | No |
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Questions & Answers
Q
What is the Cisco 1861W Router (SKU C1861W-SRST-B/K9)?
A
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.
Q
What are the key features of the C1861W-SRST-B/K9?
A
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.
Q
How many users can the 1861W support with SRST?
A
The 1861W supports up to 8 concurrent SRST (Survivable Remote Site Telephony) users for Cisco Unified Communications Manager fallback during WAN outages.
Q
What is Cisco SRST and how does it work?
A
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.
Q
How many FXS ports are available on the C1861W?
A
The router includes 4 FXS ports for connecting analog phones, fax machines and key systems directly to the voice gateway.
Q
How many BRI interfaces does the router have?
A
It features 2 ISDN BRI S/T interfaces for primary or backup ISDN voice and data connectivity.
Q
What is the PoE capacity of the C1861W?
A
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.
Q
What service provider IOS image is supported?
A
The router runs the Cisco Service Provider Advanced IP Services IOS, enabling MPLS, advanced QoS, VPNs, multicast and comprehensive routing protocols.
Q
Which wireless standard does the 1861W support?
A
It integrates a dual-band 802.11n access point delivering up to 300 Mbps, supporting WPA2-PSK, 802.1X authentication and advanced RF management.
Q
What is the purpose of the HWIC slot?
A
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.
Q
What are the power supply options?
A
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.
Q
What are common use cases for this router?
A
Ideal for small to medium branch offices requiring converged data, voice and wireless: secure WAN connectivity, IP telephony with SRST fallback and integrated WLAN.
Q
How do I configure Cisco Unified Communications Manager Express (CME)?
A
Use the IOS CLI: enable telephony-service, define SRST parameters, configure dial-peers and ephone/ephone-template profiles; save and reload for activation.
Q
What is the difference between CME and SRST?
A
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.
Q
Is the C1861W rack-mountable?
A
Yes. It supports an optional 19″ rack-mount kit and rubber feet for desktop deployment, allowing flexible installation in wiring closets or on desks.
Q
What warranty and support options are available?
A
Includes limited lifetime hardware warranty. Cisco SMARTnet® contracts deliver 24x7 technical support, OS updates, and advance hardware replacement services.
