United States$5,000,000+
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James Lewis
5
Powerful SRST router with stable voice and data. Ensures seamless communication during WAN outages.
C1861-SRST-C-B/K9
1861,8-user SRST or CME,CUE,4FXS,2BRI,8POE,SP Svcs,HWIC slot
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C1861-SRST-C-B/K9
- Description:
- 1861,8-user SRST or CME,CUE,4FXS,2BRI,8POE,SP Svcs,HWIC slot
- Rating:
Added to cart 28 times recently
- Availability:
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- Brand:
- Cisco
- GTIN:
- 882658184963
- Condition:
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C1861-SRST-C-B/K9 Overview
C1861-SRST-C-B/K9 is a high-performance enterprise router built with a fixed architecture that provides reliable connectivity with flexible power options, including a redundant AC power supply to ensure continuous operation. It features dedicated 10/100 WAN and LAN interfaces along with integrated services such as voice and video to support unified communications in branch offices and remote sites.
Designed with modular capabilities, this router offers expansion slots for additional network interface modules and advanced VPN features that secure remote connectivity. With throughput reaching up to 0.02 Gbps, built-in redundancy for high availability, and optimized performance for business-critical use cases, C1861-SRST-C-B/K9 is ideally suited for enterprise and small business deployments.
C1861-SRST-C-B/K9 price is is available on request. Get immediate quote.
Request bulk order quote for C1861-SRST-C-B/K9 for additional pricing. Browse the full Router Isr 1800 series or explore all Cisco products.
C1861-SRST-C-B/K9 Specifications
- Memory
- 256 MB
- Flash Memory
- 256 MB
- Ethernet Technology
- 10/100
- Form Factor
- Desktop
- Weight
- N/A
- Height
- N/A
- Depth
- N/A
- Width
- N/A
- Product Type
- Enterprise Router
- Architecture
- Fixed
- Wi-Fi Standard
- N/A
- Connectivity Type
- Wired
- Compliance Standards
- FCC, CE
- Wireless Support
- No
- Firewall Features
- Yes
- Management
- Managed
- Integrated Services
- Voice, Video
- Safety
- N/A
- EMC
- N/A
- Telecom
- N/A
- QoS Features
- Supported
- Built-in Security Features
- Firewall, Intrusion Prevention
- Stacking Capability
- No
- 5G Support
- No
- Interface Ports
- RJ-45
- Device Type
- Router
- WAN Configuration
- WAN
- Network Protocols
- IPv4, IPv6
- High Availability Support
- Supported
- Expansion Slots
- EHWIC
- Broadband
- N/A
- Speed/Capacity
- N/A
- Modular Slots Available
- 1 Slot
- LAN Ports
- 4 LAN Ports
- WAN Ports
- 1 WAN
- Routing Protocols
- OSPF / EIGRP / RIP / Static Routing
- Power
- 65 W
- Power Source
- AC Power Supply / Redundant
- Use Case
- Enterprise, Small Business
- Throughput Capacity
- 0.02 Gbps
- VPN Support
- IPSec VPN / N/A
- Remote Management
- HTTP, HTTPS, SSH, Telnet
- Features
- VPN, Voice, Video, IPv6 Compatible, Firewall
- Product Name
- C1861-SRST-C-B/K9
C1861-SRST-C-B/K9 Use Case
High-Availability Branch Office Telephony with SRST and PoE
In distributed branch environments, the Cisco C1861-SRST-C-B/K9 router delivers 8-user SRST and 8 PoE ports to sustain IP phone operations during WAN outages. By enabling local call processing and power over Ethernet for critical handsets, organizations maintain uninterrupted voice services, reinforce disaster resilience, and uphold corporate SLAs.
All-in-One SMB Unified Communications with CME, CUE, FXS and BRI
A growing SMB consolidates telephony by deploying the Cisco 1861 platform with CME, CUE, 4 FXS ports for analog fax/phones, and 2 BRI interfaces for ISDN backup. The integrated solution streamlines voice, voicemail, and fax services into a single appliance, reducing CAPEX, lowering operational complexity, and accelerating time-to-service.
Service Provider Edge Aggregation with SP Services and HWIC Expansion
Service providers leverage the C1861-SRST-C-B/K9 with SP Services license and an HWIC slot to aggregate multi-protocol voice/data across multi-dwelling units. With 8 PoE ports for customer IP handsets, 4 FXS for analog fallback, and 2 BRI for redundancy, providers deliver rapid service provisioning, scalable growth, and optimized bandwidth utilization for improved ROI.
Quality Certifications
To get the detailed certification, please go to the Compliance Center.
Product Comparison Table
 C1861-SRST-C-B/K9 |  CISCO1802 |  CISCO1803/K9 |  CISCO1841-ADSL2-B |  C1841-3G-S | |
|---|---|---|---|---|---|
| 5G Support | No | No | No | No | No |
| Architecture | Fixed | Fixed | Fixed | Fixed | Fixed |
| Broadband | N/A | DSL | N/A | DSL | N/A |
| Built-in Security Features | Firewall, Intrusion Prevention | Firewall, Intrusion Prevention | Firewall / Intrusion Prevention / Malware Protection | Firewall / Intrusion Prevention | Firewall / Intrusion Prevention |
| Compliance Standards | FCC, CE | IEEE 802.3, 802.3u, 802.3ab | FCC / CE | FCC / CE | FCC / CE / UL |
| Connectivity Type | Wired | Wired | Wired | Wired / Ethernet | Wired |
| Depth | N/A | 13 inches | N/A | 16.0 inches | N/A |
| Device Type | Router | Router | Router | Router | Router |
| EMC | N/A | FCC, CE | N/A | FCC Part 15 | N/A |
| Ethernet Technology | 10/100 | 10/100/1000 | 10/100 | 10/100 | 10/100 |
| Expansion Slots | EHWIC | NIM, EHWIC | EHWIC | EHWIC / NIM | EHWIC |
| Features | VPN, Voice, Video, IPv6 Compatible, Firewall | VPN, VoIP, IPv6 Compatible, Firewall, MPLS | VPN / IPv6 Compatible / Firewall / Voice | VPN / IPv6 Compatible / Firewall | VPN / VoIP / 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 | Rack-mount | Rack-mount | Desktop |
| Height | N/A | 1.75 inches | 1.75 inches | 1.7 inches | N/A |
| High Availability Support | Supported | Supported | Not Supported | Not Supported | Not Supported |
| Integrated Services | Voice, Video | Voice, Video, WAN Optimization | Voice / Video | Voice / Video | Voice / Video / WAN Optimization |
| Interface Ports | RJ-45 | RJ-45, Combo Ports | RJ-45 | RJ-45 | RJ-45 |
| LAN Ports | 4 LAN Ports | 4 LAN Ports | 4 LAN Ports | N/A | N/A |
| Management | Managed | Managed | Managed | Managed | Managed |
| Memory | 256 MB | 512 MB | 256 MB | 128 MB | 128 MB |
| Modular Slots Available | 1 Slot | 2 Slots | 2 Slots | 2 Slots | 2 Slots |
| Network Protocols | IPv4, IPv6 | IP, TCP, UDP, HTTP, SNMP | TCP/IP / IPX | IPv4 / IPv6 | IPv4 / IPv6 |
| Power | 65 W | 150W | 65 Watts | 60 W | 65W |
| Power Source | AC Power Supply / Redundant | AC Power Supply with Redundant Option | AC Power Supply | AC Power Supply | AC Power Supply |
| Product Name | C1861-SRST-C-B/K9 | Cisco 1802 Integrated Services Router | Cisco 1803/K9 Integrated Services Router | Cisco 1841 ADSL2-B Router | Cisco C1841-3G-S Integrated Services Router |
| Product Type | Enterprise Router | Enterprise Router | Enterprise Router | Enterprise Router | Enterprise Router |
| QoS Features | Supported | Supported | Supported | Supported | Supported |
| Remote Management | HTTP, HTTPS, SSH, Telnet | Telnet, SSH, SNMP, HTTPS | CLI / SNMP | Telnet / SSH / SNMP | Telnet / SSH / SNMP |
| Routing Protocols | OSPF / EIGRP / RIP / Static Routing | OSPF / BGP / EIGRP / Static Routing | OSPF / BGP / EIGRP / RIP / Static Routing | OSPF / EIGRP / RIP / Static Routing | OSPF / BGP / EIGRP / RIP / Static Routing |
| Safety | N/A | UL, CE | N/A | UL Listed | N/A |
| Speed/Capacity | N/A | Gigabit | Fast Ethernet | N/A | N/A |
| Stacking Capability | No | Yes | No | No | No |
| Telecom | N/A | ETSI | N/A | N/A | N/A |
| Throughput Capacity | 0.02 Gbps | 1 Gbps | 25 Mbps | 0.025 Gbps | 0.025 Gbps |
| Use Case | Enterprise, Small Business | Enterprise / Business | Small Business / Enterprise | Business | Enterprise |
| VPN Support | IPSec VPN / N/A | IPSec / SSL VPN | IPSec / GRE / DMVPN | IPSec / SSL VPN | IPSec |
| WAN Configuration | WAN | Dual WAN | Dual WAN | WAN | WAN |
| WAN Ports | 1 WAN | 2 WAN | 2 WAN | 1 WAN | 1 WAN |
| Weight | N/A | 15 lbs | 6.6 lbs | 13 lbs | N/A |
| Wi-Fi Standard | N/A | N/A | N/A | N/A | N/A |
| Width | N/A | 17 inches | 17 inches | 19.0 inches | N/A |
| Wireless Support | No | No | No | No | No |
Reviews & Ratings
G
Grace Johnson
4
Cisco 1861-SRST-C-B handles POE and voice services efficiently. Easy to configure and manage.
M
Megan White
5
Reliable branch office solution. SRST backup keeps calls running smoothly during failures.
D
David Harris
3
Consistent performance with strong security. Ideal for small offices needing unified communications.
Z
Zoe Mitchell
4
Durable and dependable. Cisco SRST ensures voice and data continuity in remote sites.
Questions & Answers
What is the Cisco 1861-SRST-C-B/K9 router?
The Cisco 1861-SRST-C-B/K9 is a high-performance Integrated Services Router delivering 8-user SRST or CME failover, CUE voice mail, 4 FXS, 2 BRI, 8 PoE ports, service provider services, and an HWIC slot for expansion.
How many Power over Ethernet (PoE) ports does the 1861-SRST-C-B/K9 offer?
It provides eight IEEE 802.3af-compliant PoE ports with a total power budget of up to 110W to support IP phones, cameras, and wireless access points.
Does the Cisco 1861-SRST-C-B/K9 support Survivable Remote Site Telephony (SRST)?
Yes, it supports up to eight concurrent SRST sessions for automatic Cisco Unified Communications Manager failover at remote sites.
What voice interfaces are integrated in the 1861-SRST-C-B/K9?
It includes four FXS ports for analog phones and two BRI interfaces for ISDN connectivity, enabling flexible voice deployments.