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C1861-SRST-C-B/K9
1861,8-user SRST or CME,CUE,4FXS,2BRI,8POE,SP Svcs,HWIC slot
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Enterprise Clients
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Ten years serving buyers who audit their vendors. From federal agencies to 20,000+ enterprise clients worldwide.
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.
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.
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 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.
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| 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 |
| 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 |
| Device Type | Router | Router | Router | Router | Router |
| 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 |
| 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 |
| 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 |
| Stacking Capability | No | Yes | No | No | No |
| 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 |
| Wireless Support | No | No | No | No | No |
Every unit is authentic, sourced through trusted and authorised channels, and serial-verified on request. Genuine networking and IT hardware, guaranteed, or your money back.
New products are backed by up to 3 years of extended warranty, and certified refurbished units by up to 3 months, for dependable protection on every order. Coverage is clear, honoured in full, and confirmed on each product page.
If a unit ever falls short, our streamlined RMA process gets a replacement to you fast, with advance replacement available to keep your network running. No jargon, no runaround.
Every device is inspected, bench-tested, and firmware-verified, with configurations wiped before dispatch. Additional testing can be arranged to confirm full working condition on request.
Our specialists assist with compatibility, configuration, licensing, and installation, before and after you buy. Real hardware expertise, whenever you need it.
dispatched quickly and shipped worldwide from regional hubs, fully tracked and insured.
Powerful SRST router with stable voice and data. Ensures seamless communication during WAN outages.
Cisco 1861-SRST-C-B handles POE and voice services efficiently. Easy to configure and manage.
Reliable branch office solution. SRST backup keeps calls running smoothly during failures.
Consistent performance with strong security. Ideal for small offices needing unified communications.
Durable and dependable. Cisco SRST ensures voice and data continuity in remote sites.
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.
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.
Yes, it supports up to eight concurrent SRST sessions for automatic Cisco Unified Communications Manager failover at remote sites.
It includes four FXS ports for analog phones and two BRI interfaces for ISDN connectivity, enabling flexible voice deployments.
Yes, the router features one HWIC slot that supports a wide range of interface cards, including additional Ethernet, serial, and voice modules.
It provides up to 25 Mbps of IP forwarding performance, ensuring reliable data, voice, and video transport for branch applications.
The router ships with 256 MB of DRAM and a 64 MB CompactFlash card for Cisco IOS images and configuration files.
You can manage it via Cisco IOS CLI, web-based Device Manager, or network management tools such as Cisco Works for centralized administration.
It includes an integrated internal AC power supply (100–240V) with optional DC power module support for carrier environments.
The chassis measures 1.75 x 17.5 x 15 inches (4.45 x 44.45 x 38.1 cm) and weighs approximately 13.2 lbs (6 kg).
To enable full security, VPN, and voice features you need the Cisco IOS Security license plus the Cisco Unified Communications license for CME or CUE.
Yes, the router supports the Cisco Unity Express application module for on-premises voicemail and automated attendant services.
Enable SRST with the 'telephony-service' and 'srst' commands in Cisco IOS, define port assignments, and register IP phones to local SRST.
It supports up to two BRI S/T interfaces and multiple WAN options via the HWIC slot, including T1/E1 and serial connections.
Cisco offers a one-year limited hardware warranty with optional SMARTnet service for 24/7 access to software updates and technical support.
United States
